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Retirement Benefits (Changes In The Fair Value Of Plan Assets Classified As Level 3) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Other Debt Securities [Member]
Fair value of plan assets at beginning of year		$ 1,000,000
Purchases, Sales and Settlements, net		(1,000,000)
Real Estate [Member]
Fair value of plan assets at beginning of year	98,000,000	90,000,000
Actual Return on Plan Assets Related to Assets Still Held at the Reporting Date	10,000,000	7,000,000
Purchases, Sales and Settlements, net		1,000,000
Fair value of plan assets at end of year	108,000,000	98,000,000
Private Equity [Member]
Fair value of plan assets at beginning of year	28,000,000	33,000,000
Actual Return on Plan Assets Related to Assets Still Held at the Reporting Date	(10,000,000)	(5,000,000)
Actual Return on Plan Assets Related to Assets Sold During the Period	11,000,000	7,000,000
Purchases, Sales and Settlements, net	(6,000,000)	(7,000,000)
Fair value of plan assets at end of year	$ 23,000,000	$ 28,000,000

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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