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Derivative Instruments and Hedging Activity - Fair Value of Derivative Instruments Included in Balance Sheets (Details) - Cash Flow Hedges [Member] - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Derivatives, Fair Value [Line Items]    
Assets $ 0 $ 13
Liabilities 685 105
Other Current Assets [Member]    
Derivatives, Fair Value [Line Items]    
Assets 0 7
Other Noncurrent Assets [Member]    
Derivatives, Fair Value [Line Items]    
Assets 0 6
Other Current Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Liabilities 6 1
Derivatives [Member]    
Derivatives, Fair Value [Line Items]    
Liabilities 679 104
Interest Rate Contract [Member]    
Derivatives, Fair Value [Line Items]    
Assets 0 13
Liabilities 685 105
Not Designated as Hedging Instrument [Member] | Interest Rate Contract [Member]    
Derivatives, Fair Value [Line Items]    
Assets 13 24
Liabilities $ 698 $ 116