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Debt - Senior Notes (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Jun. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Feb. 28, 2019
Dec. 31, 2018
Jul. 31, 2018
Debt Instrument [Line Items]                
Debt extinguishment loss $ 0 $ 17,000,000 $ 10,000,000 $ 5,000,000 $ 27,000,000      
6.75% Senior notes due 2024                
Debt Instrument [Line Items]                
Debt instrument face amount           $ 1,000,000,000.0    
Stated interest rate 6.75%     6.75%   6.75%    
Long-term debt, principal balance $ 1,000,000,000     $ 1,000,000,000     $ 0  
Senior Notes Due 2022                
Debt Instrument [Line Items]                
Stated interest rate 6.50%     6.50%        
Long-term debt, principal balance $ 1,200,000,000     $ 1,200,000,000     $ 1,200,000,000  
Senior Notes | Senior Notes Due 2022                
Debt Instrument [Line Items]                
Repurchase amount               $ 400,000,000
Long-term debt, principal balance               $ 1,600,000,000
Debt extinguishment loss   $ 17,000,000