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Derivative Financial Instruments - The Fair Values of Derivative Instruments (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Derivatives, Fair Value [Line Items]
Derivative fair value of derivative net, asset	$ 30	$ 29
Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative fair value of derivative net, asset	30	29
Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative fair value of derivative net, liability

Fair value of liability associated with derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

+ References+ Details

- Definition

Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

+ References+ Details