Equity - AOCI Changes Net of Tax Table (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax Period Start			$ (143)
Net Other Comprehensive Income	$ 12	$ 3	24	$ 11
Accumulated Other Comprehensive Income (Loss), Net of Tax Period End	(119)		(119)
Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax Period Start			(143)	(167)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			6	3
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			18	13
Net Other Comprehensive Income			24	16
Accumulated Other Comprehensive Income (Loss), Net of Tax Period End	(119)	(151)	(119)	(151)
Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax Period Start			0	5
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			0	0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			0	(5)
Net Other Comprehensive Income			0	(5)
Accumulated Other Comprehensive Income (Loss), Net of Tax Period End	0	0	0	0
AOCI Including Portion Attributable to Noncontrolling Interest [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax Period Start			(143)	(162)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			6	3
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			18	8
Net Other Comprehensive Income			24	11
Accumulated Other Comprehensive Income (Loss), Net of Tax Period End	$ (119)	$ (151)	$ (119)	$ (151)