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Goodwill and Intangible Assets Intangible Assets (Details) (USD $)
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12 Months Ended | |||||||||
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2009
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| Finite-Lived Intangible Assets [Line Items] | ||||||||||
| Gross Carrying Value | $ 17,949,000,000 | $ 21,522,000,000 | ||||||||
| Accumulated Amortization | 9,928,000,000 | 11,599,000,000 | ||||||||
| In Text Details [Abstract] | ||||||||||
| Amortization of intangibles | 1,509,000,000 | [1] | 1,731,000,000 | [1] | 1,978,000,000 | [1] | ||||
| Future Amortization Expense, 2012 | 1,300,000,000 | |||||||||
| Future Amortization Expense, 2013 | 1,100,000,000 | |||||||||
| Future Amortization Expense, 2014 | 1,000,000,000 | |||||||||
| Future Amortization Expense, 2015 | 870,000,000 | |||||||||
| Future Amortization Expense, 2016 | 770,000,000 | |||||||||
| Finite Lived Intangible Assets, Fully Amortized | 3,200,000,000 | |||||||||
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Purchased credit card relationships [Member]
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| Finite-Lived Intangible Assets [Line Items] | ||||||||||
| Gross Carrying Value | 5,938,000,000 | 7,162,000,000 | ||||||||
| Accumulated Amortization | 3,765,000,000 | 4,085,000,000 | ||||||||
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Core deposit intangibles [Member]
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| Finite-Lived Intangible Assets [Line Items] | ||||||||||
| Gross Carrying Value | 3,903,000,000 | 5,394,000,000 | ||||||||
| Accumulated Amortization | 2,915,000,000 | 4,094,000,000 | ||||||||
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Customer Relationships [Member]
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| Finite-Lived Intangible Assets [Line Items] | ||||||||||
| Gross Carrying Value | 4,081,000,000 | 4,232,000,000 | ||||||||
| Accumulated Amortization | 1,532,000,000 | 1,222,000,000 | ||||||||
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Affinity Relationships [Member]
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| Finite-Lived Intangible Assets [Line Items] | ||||||||||
| Gross Carrying Value | 1,551,000,000 | 1,647,000,000 | ||||||||
| Accumulated Amortization | 948,000,000 | 902,000,000 | ||||||||
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Other Intangibles [Member]
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| Finite-Lived Intangible Assets [Line Items] | ||||||||||
| Gross Carrying Value | 2,476,000,000 | 3,087,000,000 | ||||||||
| Accumulated Amortization | 768,000,000 | 1,296,000,000 | ||||||||
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Card Services [Member]
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| In Text Details [Abstract] | ||||||||||
| Amortization of intangibles | 599,000,000 | [2] | 668,000,000 | [2] | 746,000,000 | [2] | ||||
| Intangible Assets, Sold | $ 396,000,000 | |||||||||
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