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Derivative and Hedging Activities - Components of Interest Income and Interest Expense Table (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]        
Interest expense on senior notes $ 114 $ 171 $ 336 $ 513
Amortization of loan discount, issuance costs and other 9 14 27 37
Interest expense on revolving credit facility 10 2 27 8
Gains on terminated fair value hedges (1) 0 (2) (2)
Gains on undesignated interest rate derivatives 0 0 0 (10)
Capitalized interest (59) (99) (191) (336)
Total interest expense $ 73 $ 88 $ 197 $ 210