Income Taxes (Details 5) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
A reconciliation of the beginning and ending amount of unrecognized tax benefits
Unrecognized tax benefits - January 1	$ 164	$ 169	$ 149	$ 126
Additions for:
Prior year tax positions		1	17	28
Current year tax positions		15	48	2
Purchase accounting	0		5	0
Reductions for:
Prior year tax positions		(21)	(38)	(6)
Settlements	0		(12)	(1)
Unrecognized tax benefits - December 31		$ 164	$ 169	$ 149

Reconciliation uncertain tax position purchase accounting.

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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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