Equity - AOCI Changes Net of Tax Table (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax Period Start	$ (96)
Other Comprehensive Income (Loss)	14	$ 0
Accumulated Other Comprehensive Income (Loss), Net of Tax Period End	(82)
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	(96)	(99)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	4	(4)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	10	4
Other Comprehensive Income (Loss)	14	0
Accumulated Other Comprehensive Income (Loss), Net of Tax Period End	$ (82)	$ (99)