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Fair Values of Financial Instruments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Percentage of fair value amounts for fixed maturities provided by a pricing service	99.00%
Plan assets at fair value	$ 2,305	$ 2,001
Other Postretirement Benefits [Member]
Plan assets at fair value	$ 96	$ 73

Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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