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Fair Value Measurements - Derivatives in Cash Flow Hedging Relationships (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Interest expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Loss Reclassified from OCI into Income (Effective Portion)	$ 4	$ 6
Interest rate contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Loss Recognized in OCI (Effective Portion)		$ 8

- Definition

The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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- Definition

The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

+ References+ Details