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Derivative Instruments and Hedging Activity - Gains (Losses) Related to Cash Flow Hedges (Details) - Interest Rate Contract [Member] - Designated as Hedging Instrument [Member] - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items]    
Losses reclassified from AOCI to interest expense $ (2) $ (3)
Interest Expense [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Losses recognized in interest expense $ (52) $ (2)