Provision (Benefit) for Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Current :
Federal	$ (24)	$ (61)	$ 113	$ (72)
State	(1)	1	4	3
Foreign	3	(1)	5	1
Total	(22)	(61)	122	(68)
Deferred:
Federal	95	130	(1)	212
State	6	19	5	32
Foreign	5	14	9	22
Total	106	163	13	266
Provision (benefit) for income taxes	84	102	135	198
Income Tax Contingency [Line Items]
Deferred provision due to change in tax law		10
Current income tax liabilities associated with undistributed earnings of foreign operations	$ 80		$ 80