Quarterly report pursuant to Section 13 or 15(d)

Amount and Location in the Income Statement for Derivatives Designated as Fair Value Hedges (Detail)

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Amount and Location in the Income Statement for Derivatives Designated as Fair Value Hedges (Detail) (USD $)
In Millions, unless otherwise specified
9 Months Ended 3 Months Ended
Sep. 30, 2012
Interest Rate Contracts
Sep. 30, 2011
Interest Rate Contracts
Sep. 30, 2012
Fixed-Rate Debt and Capital Leases
Sep. 30, 2011
Fixed-Rate Debt and Capital Leases
Sep. 30, 2012
Fair Value Hedging
Interest Rate Contracts
Interest Expense
Sep. 30, 2011
Fair Value Hedging
Interest Rate Contracts
Interest Expense
Sep. 30, 2012
Fair Value Hedging
Fixed-Rate Debt and Capital Leases
Interest Expense
Sep. 30, 2011
Fair Value Hedging
Fixed-Rate Debt and Capital Leases
Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]                
Amount of Gain (Loss) Recognized in Income $ 55 $ 350     $ 19 $ 237    
Amount of Gain (Loss) Recognized in Income     $ (55) $ (350)     $ (19) $ (237)