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Subsequent Event (Details) - USD ($)
1 Months Ended
Oct. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Subsequent Event [Line Items]      
Long-term debt   $ 3,836,000,000 $ 3,233,000,000
2021 Senior Notes | Senior Notes      
Subsequent Event [Line Items]      
Debt value   $ 1,062,000,000  
Debt interest rate, percent   4.50%  
Subsequent Event | 2021 Senior Notes | Senior Notes      
Subsequent Event [Line Items]      
Debt repurchased $ 750,000,000    
Debt interest rate, percent 4.50%    
Payment for debt redemption $ 769,000,000    
Redemption premium 19,000,000    
Loss on extinguishment of debt 18,000,000    
Long-term debt $ 312,000,000