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Employee Benefits (Details 6) (USD $) In Millions, unless otherwise specified			12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Level 3 [Member]
Information of plan assets using significant unobservable inputs
Beginning balance as of December 31, 2011	$ 1,851	$ 1,505	$ 23
Capital distributions			(5)
Ending balance as of December 31, 2012	$ 1,851	$ 1,505	$ 18

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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