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Income Taxes - Components of Income Tax Expense (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Federal
Current	$ 626	$ 551	$ 1,116	$ 955
Deferred	(104)	(92)	(92)	(24)
Federal income tax	522	459	1,024	931
State
Current	19	112	77	162
Deferred	(12)	(7)	(14)	(2)
State income tax	7	105	63	160
Total income tax provision	$ 529	$ 564	$ 1,087	$ 1,091

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.