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Income Taxes - Components of Income Tax Expense (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Federal
Current	$ 423	$ 390	$ 1,334	$ 1,506
Deferred	10	57	(19)	(35)
Federal income tax	433	447	1,315	1,471
State
Current	101	84	268	161
Deferred	(11)	11	(17)	(3)
State income tax	90	95	251	158
Applicable income taxes	$ 523	$ 542	$ 1,566	$ 1,629

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.