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Income Taxes - Components of Income Tax Expense (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Federal
Current	$ 490	$ 490
Deferred	(67)	12
Federal income tax	423	502
State
Current	83	58
Deferred	(10)	(2)
State income tax	73	56
Applicable income taxes	$ 496	$ 558

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of current state and local tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred federal income tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred state and local tax expense (benefit) pertaining to income (loss) from continuing operations.