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Equity - AOCI Changes Net of Tax Table (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Accumulated Other Comprehensive Income (Loss), Net of Tax Period Start     $ (99)  
Other Comprehensive Income (Loss) $ 3 $ 12 (2) $ 24
Accumulated Other Comprehensive Income (Loss), Net of Tax Period End (101)   (101)  
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     (99) (143)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax     (23) 6
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax     21 18
Other Comprehensive Income (Loss)     (2) 24
Accumulated Other Comprehensive Income (Loss), Net of Tax Period End $ (101) $ (119) $ (101) $ (119)