Provision (Benefit) for Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Current :
Federal	$ 137	$ (11)
State	5	2
Foreign	2	2
Total	144	(7)
Deferred:
Federal	(96)	82
State	(1)	13
Foreign	4	8
Total	(93)	103
Provision (benefit) for income taxes	51	96
Income Tax Contingency [Line Items]
Current income tax liabilities associated with undistributed earnings of foreign operations	$ 90