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Income Taxes (Income Tax Payments, Net Of Refunds) (Details) (USD $) In Millions	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Income Taxes
Income tax payments (refunds)	$ 11	$ (91)

The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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