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Retirement Plans (Schedule of Valuation of the Company's Pension Plan Assets by Pricing Categories) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Fair value of plan assets	$ 254	$ 210
(Level 1)
Fair value of plan assets	220	191
(Level 2)
Fair value of plan assets	11	2
(Level 3)
Fair value of plan assets	23	17	18
Cash and cash equivalents
Fair value of plan assets	5	5
Cash and cash equivalents \| (Level 1)
Fair value of plan assets	5	5
United States companies equity securities
Fair value of plan assets	77	71
United States companies equity securities \| (Level 1)
Fair value of plan assets	77	71
International companies equity securities
Fair value of plan assets	23	10
International companies equity securities \| (Level 1)
Fair value of plan assets	23	10
Corporate debt securities
Fair value of plan assets	93	102
Corporate debt securities \| (Level 1)
Fair value of plan assets	93	100
Corporate debt securities \| (Level 2)
Fair value of plan assets		2
Other
Fair value of plan assets	56	22
Other \| (Level 1)
Fair value of plan assets	22	5
Other \| (Level 2)
Fair value of plan assets	11
Other \| (Level 3)
Fair value of plan assets	$ 23	$ 17

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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