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Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Income Tax Contingency [Line Items]
Effective tax rate	7.70%	15.20%	10.60%	14.80%
Penalties associated with IRS Notice of proposed assessment					$ 52
IRS Notice of proposed assessment of additional federal taxes					$ 75

- Definition

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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