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Basis Of Presentation Derivative Instruments (Details) - Interest Rate Swap - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Derivative [Line Items]          
Derivative, Notional Amount $ 1,600   $ 1,600    
Not Designated as Hedging Instrument | Interest expense          
Derivative [Line Items]          
Loss Recognized on Derivatives 8 $ 24 59 $ 38  
Not Designated as Hedging Instrument | Other current and non-current liabilities          
Derivative [Line Items]          
Interest rate swap contract - other current and non-current liabilities 99   99   $ 47
August 2015          
Derivative [Line Items]          
Derivative, Notional Amount [1] 600   600    
November 2017          
Derivative [Line Items]          
Derivative, Notional Amount 450   450    
August 2020          
Derivative [Line Items]          
Derivative, Notional Amount [1] 400   400    
November 2022          
Derivative [Line Items]          
Derivative, Notional Amount $ 150   $ 150    
[1] Interest rate swaps with a notional value of $600 million expire on August 7, 2020, and interest rate swaps with a notional value of $400 million commence on August 14, 2020.