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Employee Benefit Plans (Details 4) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Fair values of the Company's pension plan assets
Total	$ 497	$ 440
Level 1 [Member]
Fair values of the Company's pension plan assets
Total	47	31
Level 2 [Member]
Fair values of the Company's pension plan assets
Total	450	409
Common and commingled trust funds [Member]
Fair values of the Company's pension plan assets
Total	438	399
Common and commingled trust funds [Member] \| Level 2 [Member]
Fair values of the Company's pension plan assets
Total	438	399
Mutual funds [Member]
Fair values of the Company's pension plan assets
Total	47	31
Mutual funds [Member] \| Level 1 [Member]
Fair values of the Company's pension plan assets
Total	47	31
Money market funds [Member]
Fair values of the Company's pension plan assets
Total	12	10
Money market funds [Member] \| Level 2 [Member]
Fair values of the Company's pension plan assets
Total	$ 12	$ 10

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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