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Schedule of Quarterly Financial Information (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2012
Quarterly Financial Information [Line Items]
Effective tax rate	144.40%
Litigation Related to Other Taxes
Quarterly Financial Information [Line Items]
Litigation relating to general excise tax, accrual	$ 110	$ 110

- 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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