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Fair Value of Financial Instruments (Details) (USD $)
In Millions, unless otherwise specified |
Dec. 31, 2012
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Dec. 31, 2011
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|---|---|---|---|---|---|---|---|---|
| Financial liabilities | ||||||||
| Long-term borrowings | $ 30,875 | $ 30,325 | ||||||
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Carrying Value
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| Financial assets | ||||||||
| Loans, notes and mortgages | 19,545 | [1] | 20,574 | [1] | ||||
| Financial liabilities | ||||||||
| Deposits | 12,873 | 12,364 | ||||||
| Long-term borrowings | 96,058 | [2] | 110,718 | [2] | ||||
| Fair value of commercial unfunded lending commitments | 60 | 208 | ||||||
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Fair Value
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| Financial assets | ||||||||
| Loans, notes and mortgages | 19,617 | [1] | 20,048 | [1] | ||||
| Financial liabilities | ||||||||
| Deposits | 12,873 | 12,364 | ||||||
| Long-term borrowings | 100,844 | [2] | 102,339 | [2] | ||||
| Fair value of commercial unfunded lending commitments | 104 | 264 | ||||||
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Level 2 | Fair Value
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| Financial assets | ||||||||
| Loans, notes and mortgages | 896 | [1] | ||||||
| Financial liabilities | ||||||||
| Deposits | 12,873 | |||||||
| Long-term borrowings | 99,528 | [2] | ||||||
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Level 3 | Fair Value
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| Financial assets | ||||||||
| Loans, notes and mortgages | 18,721 | [1] | ||||||
| Financial liabilities | ||||||||
| Deposits | ||||||||
| Long-term borrowings | $ 1,316 | [2] | ||||||
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