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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

Amount after tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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