Income Taxes (Schedule Of Changes To Unrecognized Tax Benefits) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Taxes [Abstract]
Unrecognized Tax Benefits, Beginning Balance	$ 342	$ 664	$ 572
Gross increases-tax positions in prior periods	49	36	132
Gross decreases-tax positions in prior periods	(18)	(43)	(38)
Gross increases-current period tax positions	16	5	11
Settlements	(4)	(320)	(13)
Total changes	43	(322)	92
Unrecognized Tax Benefits, Ending Balance	$ 385	$ 342	$ 664

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The gross amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns as of the balance sheet date.

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The gross amount of decreases in unrecognized tax benefits resulting from tax positions taken in prior period tax returns, excluding amounts pertaining to examined tax returns.

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The gross amount of decreases in unrecognized tax benefits resulting from settlements with taxing authorities.

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The gross amount of increases in unrecognized tax benefits resulting from tax positions that have been or will be taken in the tax return for the current period, excluding amounts pertaining to examined tax returns.

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The gross amount of increases in unrecognized tax benefits resulting from tax positions taken in prior period tax returns, excluding amounts pertaining to examined tax returns.

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The net amount of all increases and decreases in unrecognized tax benefits for the period.

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