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Income Taxes (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2012
Income Taxes
Statutory U.S. Federal tax rate (as a percent)	35.00%
Increase (Decrease) in unrecognized tax benefits related to uncertain tax positions	$ (35)
Reasonably possible decrease in unrecognized tax benefits related to audit settlements or statute expirations	$ 30

The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems.

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