Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Income Tax Contingency [Line Items]
Income tax benefit (expense)	$ 142	$ (59)	$ 72	$ (188)
Deferred Tax Liabilities, Net	1,600		1,600		$ 1,600
Deferred Tax Assets, Net, Current	37		37		26
Subsidiaries [Member]
Income Tax Contingency [Line Items]
Income tax benefit (expense)			0	$ 0
Deferred Tax Liabilities, Net	20		$ 20		$ 236
The Election [Member]
Income Tax Contingency [Line Items]
Increase in tax basis	645
Income tax benefit (expense)	$ 169