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Commitments and Contingencies - Additional Information (Details) (USD $)
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3 Months Ended | 6 Months Ended | 0 Months Ended | |||||||||||||||||||
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Jun. 30, 2012
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Jun. 30, 2011
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Jun. 30, 2012
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Jun. 30, 2011
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Dec. 31, 2011
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Dec. 31, 2010
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Jun. 30, 2012
522110 Commercial Banking [Member]
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Dec. 31, 2011
522110 Commercial Banking [Member]
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Jun. 30, 2012
S P Es [Member]
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Dec. 31, 2011
S P Es [Member]
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Jun. 30, 2012
Financial Guarantee [Member]
Guarantee Life Insurance Book Value Protection Derivative [Member]
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Jun. 30, 2012
Financial Guarantee [Member]
Guarantee Life Insurance Book Value Protection Derivative [Member]
Maximum [Member]
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Jun. 30, 2012
Financial Guarantee [Member]
Guarantee Employee Retirement Protection Derivative [Member]
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Dec. 31, 2011
Financial Guarantee [Member]
Guarantee Employee Retirement Protection Derivative [Member]
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Jun. 30, 2012
Payment Guarantee [Member]
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Dec. 31, 2011
Payment Guarantee [Member]
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Jul. 13, 2012
Definitive Settlement Agreement [Member]
Settlement of the Interchange and Related Litigation Class Action and Individual Claims [Member]
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Jul. 13, 2012
Definitive Settlement Agreement, Class Plaintiffs [Member]
Settlement of the Interchange and Related Litigation Class Action and Individual Claims [Member]
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Jul. 13, 2012
Definitive Settlement Agreement, Individual Actions [Member]
Settlement of the Interchange and Related Litigation Class Action and Individual Claims [Member]
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Jul. 13, 2012
Distribution, Proceeds from Escrow Fund [Member]
Definitive Settlement Agreement [Member]
Settlement of the Interchange and Related Litigation Class Action and Individual Claims [Member]
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Jul. 13, 2012
Distribution, Cash [Member]
Definitive Settlement Agreement [Member]
Settlement of the Interchange and Related Litigation Class Action and Individual Claims [Member]
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Jul. 13, 2012
MasterCard and Visa [Member]
Definitive Settlement Agreement, Class Plaintiffs [Member]
Settlement of the Interchange and Related Litigation Class Action and Individual Claims [Member]
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| Guarantor Obligations [Line Items] | ||||||||||||||||||||||
| Unfunded equity investment commitments | $ 369,000,000 | $ 369,000,000 | $ 772,000,000 | |||||||||||||||||||
| Commitment to purchase residential mortgage and commercial real estate loans | 2,200,000,000 | 2,200,000,000 | 2,500,000,000 | |||||||||||||||||||
| Forward Dated Resale and Securities Borrowing Agreements Commitment | 95,700,000,000 | 95,700,000,000 | 67,000,000,000 | |||||||||||||||||||
| Forward Dated Repurchase And Securities Lending Agreements Commitment | 39,900,000,000 | 39,900,000,000 | 42,000,000,000 | |||||||||||||||||||
| Commitment to Enter Contingent Forward Dated Resale Agreement | 2,100,000,000 | 2,100,000,000 | ||||||||||||||||||||
| Operating Leases, Future Minimum Payments Due [Abstract] | ||||||||||||||||||||||
| 2012 | 1,500,000,000 | 1,500,000,000 | ||||||||||||||||||||
| 2013 | 2,800,000,000 | 2,800,000,000 | ||||||||||||||||||||
| 2014 | 2,300,000,000 | 2,300,000,000 | ||||||||||||||||||||
| 2015 | 1,800,000,000 | 1,800,000,000 | ||||||||||||||||||||
| 2016 | 1,500,000,000 | 1,500,000,000 | ||||||||||||||||||||
| Thereafter | 7,300,000,000 | 7,300,000,000 | ||||||||||||||||||||
| Committed Minimum Fees On Market Data Communications Systems Consulting And Other Office Related Services | 1,700,000,000 | 1,700,000,000 | 1,900,000,000 | |||||||||||||||||||
| Notional Amount of Derivatives | 1,646,434,000,000 | 1,646,434,000,000 | 1,903,782,000,000 | 3,200,000,000 | 3,200,000,000 | 1,600,000,000 | 1,800,000,000 | 15,800,000,000 | 5,100,000,000 | 22,900,000,000 | 28,800,000,000 | |||||||||||
| Life Insurance Book Value Protection, Fair Value Liability | 39,000,000 | 39,000,000 | 48,000,000 | |||||||||||||||||||
| Merchant Services Transactions Processed And Settled By Sponsored Entitites | 155,600,000,000 | 109,900,000,000 | 288,800,000,000 | 194,800,000,000 | ||||||||||||||||||
| Losses As Result Of Cardholder Disputed Transactions | 2,000,000 | 3,000,000 | 4,000,000 | 5,000,000 | ||||||||||||||||||
| Equity Method Investment, Ownership Percentage | 49.00% | |||||||||||||||||||||
| Merchant escrow deposits held as collateral | 265,000,000 | 265,000,000 | 238,000,000 | |||||||||||||||||||
| Guarantor Obligations, Maximum Exposure, Undiscounted | 249,400,000,000 | 249,400,000,000 | 236,000,000,000 | |||||||||||||||||||
| Registration Payment Arrangement, Maximum Potential Consideration | 3,200,000,000 | 3,700,000,000 | ||||||||||||||||||||
| Loss Contingency Accrual, at Carrying Value | 312,000,000 | 312,000,000 | 476,000,000 | |||||||||||||||||||
| Litigation Settlement, Expense | 963,000,000 | 2,300,000,000 | 1,800,000,000 | 3,200,000,000 | ||||||||||||||||||
| Litigation Settlement Distribution of Amount Equal to Interchange Rate Basis Points | 10.00% | |||||||||||||||||||||
| Litigation Settlement Distribution of Amount Equal to Interchange Rate Basis Points, Period of Distribution | 8 months | |||||||||||||||||||||
| Litigation Settlement Distribution of Amount Equal to Interchange Basis Points, Opt-out Period | 60 days | |||||||||||||||||||||
| Loss Contingency, Range of Possible Loss, Minimum | 0 | 0 | ||||||||||||||||||||
| Loss Contingency, Range of Possible Loss, Maximum | 4,100,000,000 | 4,100,000,000 | ||||||||||||||||||||
| Litigation Settlement, Aggregate Amount | 6,050,000,000 | |||||||||||||||||||||
| Litigation Settlement, Gross | $ 738,000,000 | $ 525,000,000 | $ 539,000,000 | $ 199,000,000 | ||||||||||||||||||