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Income Taxes (Summary Of Interest And Penalties Recognized) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2009	Dec. 31, 2011	Dec. 31, 2010
Income Taxes [Abstract]
Net interest income recognized related to income taxes		$ 12	$ 26
Net interest expense recognized related to income taxes	7
Interest receivable related to income taxes included in the consolidated balance sheets		8	33
Accruals for the payment of penalties included in the consolidated balance sheets			$ 3

This element represents the amount of statutory penalties accrued as of the date of the statement of financial position for a tax position claimed or expected to be claimed by the entity, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties.

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