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Fair Value of Financial Instruments (Details) (USD $)
In Millions, unless otherwise specified |
Mar. 31, 2013
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Dec. 31, 2012
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|---|---|---|---|---|---|---|---|---|
| Financial liabilities | ||||||||
| Long-term borrowings | $ 33,568 | $ 30,875 | ||||||
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Carrying Value
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| Financial assets | ||||||||
| Loans, notes and mortgages | 20,105 | [1] | 19,545 | [1] | ||||
| Financial liabilities | ||||||||
| Deposits | 11,802 | 12,873 | ||||||
| Long-term borrowings | 93,920 | [2] | 96,058 | [2] | ||||
| Commerical Unfunded Lending Commitments, Fair Value Disclosure | 46 | 60 | ||||||
|
Fair Value
|
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| Financial assets | ||||||||
| Loans, notes and mortgages | 20,187 | [1] | 19,617 | [1] | ||||
| Financial liabilities | ||||||||
| Deposits | 11,802 | 12,873 | ||||||
| Long-term borrowings | 100,108 | [2] | 100,844 | [2] | ||||
| Commerical Unfunded Lending Commitments, Fair Value Disclosure | 82 | 104 | ||||||
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Level 2 | Fair Value
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| Financial assets | ||||||||
| Loans, notes and mortgages | 514 | [1] | 896 | [1] | ||||
| Financial liabilities | ||||||||
| Deposits | 11,802 | 12,873 | ||||||
| Long-term borrowings | 98,823 | [2] | 99,528 | [2] | ||||
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Level 3 | Fair Value
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| Financial assets | ||||||||
| Loans, notes and mortgages | 19,673 | [1] | 18,721 | [1] | ||||
| Financial liabilities | ||||||||
| Deposits | ||||||||
| Long-term borrowings | $ 1,285 | [2] | $ 1,316 | [2] | ||||
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