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Employee Benefits (Details 7) (Pension Benefits [Member], USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Fair values of the pension plan assets [Abstract]
Plan assets at fair value	$ 2,001	$ 1,922
Short term investments [Member]
Fair values of the pension plan assets [Abstract]
Plan assets at fair value	45	64
Fixed Maturities [Member]
Fair values of the pension plan assets [Abstract]
Plan assets at fair value	735	638
Equity Securities [Member]
Fair values of the pension plan assets [Abstract]
Plan assets at fair value	1,174	1,181
U.S. Government and government agency and authority obligations [Member] \| Fixed Maturities [Member]
Fair values of the pension plan assets [Abstract]
Plan assets at fair value	207	168
Corporate bonds [Member] \| Fixed Maturities [Member]
Fair values of the pension plan assets [Abstract]
Plan assets at fair value	290	272
Foreign government and government agency obligations [Member] \| Fixed Maturities [Member]
Fair values of the pension plan assets [Abstract]
Plan assets at fair value	62	41
Mortgage-backed securities [Member] \| Fixed Maturities [Member]
Fair values of the pension plan assets [Abstract]
Plan assets at fair value	176	157
Other assets [Member]
Fair values of the pension plan assets [Abstract]
Plan assets at fair value	$ 47	$ 39

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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