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Fair Value (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Unrealized (loss) gain on cash flow hedge $ 0 $ (3) $ 5 $ (18)  
Derivative notional amount, Interest Rate Swap 300   300   $ 300
Interest Rate Derivative Assets, at Fair Value         (15)
Interest Rate Derivative Liabilities, at Fair Value (10)   (10)    
Long-term Debt 1,610   1,610   1,792
Long-term Debt, fair value 1,654   1,654   1,822
Fair Value Inputs, Level 1 [Member]          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Long-term Debt, fair value 0   0   0
Fair Value Inputs, Level 2 [Member]          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Long-term Debt, fair value 1,606   1,606   1,767
Fair Value Inputs, Level 3 [Member]          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Long-term Debt, fair value $ 48   $ 48   $ 55