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Derivative Financial Instruments - Impact of Derivatives on Consolidated Statements of Changes in Stockholders' Equity (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Derivative Instruments, Gain (Loss) [Line Items]      
Total gain (losses) on cash flow hedges $ 16 $ (7) $ (4)
Realized losses recognized in interest expense 2,210 2,561 2,401
Total change in stockholders' equity for unrealized gains on derivatives 22 9 31
Reclassification out of Accumulated Other Comprehensive Income [Member] | Realized Gain (Loss) on Derivatives [Member]
     
Derivative Instruments, Gain (Loss) [Line Items]      
Realized losses recognized in interest expense $ 6 $ 16 $ 35