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Derivative and Hedging Activities - Cash Flow Hedges Components of AOCI Table (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Accumulated Other Comprehensive Income (Loss), Net of Tax Period Start     $ (99)  
Other Comprehensive Income (Loss), Net Change in Fair Value, Net of Tax $ (4) $ 7 (23) $ 6
Other Comprehensive Income (Loss), Losses Reclassified to Income, Net of Tax 7 5 21 18
Accumulated Other Comprehensive Income (Loss), Net of Tax Period End (101)   (101)  
Cash Flow Hedging [Member]        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Accumulated Other Comprehensive Income (Loss), Before Tax, Period Start (163) (211) (160) (231)
Accumulated Other Comprehensive Income (Loss), Net of Tax Period Start (104) (131) (99) (143)
Other Comprehensive Income (Loss), Net Change in Fair Value, Before Tax (4) 12 (23) 10
Other Comprehensive Income (Loss), Losses Reclassified to Income, Before Tax 7 7 23 29
Other Comprehensive Income (Loss), Losses Reclassified to Income, Net of Tax 7 5 21 18
Accumulated Other Comprehensive Income (Loss), Before Tax, Period End (160) (192) (160) (192)
Accumulated Other Comprehensive Income (Loss), Net of Tax Period End $ (101) $ (119) $ (101) $ (119)