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Amount and Location in the Income Statement for Derivatives Designated as Fair Value Hedges (Detail) (Fair Value Hedging, Interest Expense, USD $)
In Millions, unless otherwise specified |
12 Months Ended | |
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Dec. 31, 2011
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Dec. 31, 2010
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Interest rate contracts
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| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Amount of Gain (Loss) Recognized in Income | $ 320 | $ 134 |
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Fixed-Rate Debt and Capital Leases
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| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Amount of Gain (Loss) Recognized in Income | $ (320) | $ (134) |