Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Deferred tax liability:
Less net current deferred tax liability	$ 0		$ 0		$ 22
Income tax reconciliation to US federal statutory rate
Amount computed using the statutory rate	152	(3)	156	43
Increase (decrease) in taxes resulting from:
State and local income taxes, net of federal effect	4	1	9	4
Total income tax provision (benefit)	$ 156	$ (2)	$ 165	$ 47
Income Taxes (Textuals) [Abstract]
Federal statutory tax rate			35.00%
Effective Income Tax Rate Reconciliation, Percent	35.80%	32.90%	37.00%	38.20%