Income Taxes (Schedule Of Reconciliation Of Beginning And Ending Amount Of 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 - January 1	$ 1,198	$ 1,787	$ 1,453
Gross increases - tax positions in prior periods	154	95	219
Gross decreases - tax positions in prior periods	(383)	(465)	(31)
Gross increases - current-period tax positions	28	76	148
Gross decreases - current-period tax positions	(15)	(40)
Settlements	(42)	(254)
Lapse of statute of limitations	(1)	(1)	(2)
Unrecognized tax benefits - December 31	$ 939	$ 1,198	$ 1,787

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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 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 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 decreases in unrecognized tax benefits resulting from lapses of the applicable statutes of limitations.

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