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Benefit Obligations Benefit Obligations (Schedule of Level 3 Fair Value Measurement of Pension Assets Using Significant Unobservable Inputs) (Details) (Unobservable Inputs (Level 3) [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at beginning of period	$ 0	$ 26
Unrealized gain (loss)	0	3
Purchases, sales, issuances and settlements, net	0	(29)
Fair value of plan assets at end of period	$ 0	$ 0

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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