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Accounting for Derivative Instruments and Hedging Activities - Impact of Statement of Operations (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Interest Rate Contract | Interest Expense      
Derivative Instruments, Gain (Loss) [Line Items]      
Unrealized (loss) gain on derivatives, net of tax $ (65) $ 15 $ 6
Energy Related Derivative      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, loss on derivative $ 9