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Subsequent Events (Details) - USD ($)
$ in Millions
12 Months Ended
Jan. 17, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Subsequent events        
Proceeds from issuance of debt   $ 1,056 $ 2,054 $ 1,144
Aggregate net loss   $ (41) $ (3) $ (55)
9.00% Senior Notes due July 2023        
Subsequent events        
Debt instrument interest rate stated percentage   9.00%    
Subsequent Event | 8.00% Senior Unsecured Notes due February 2027        
Subsequent events        
Debt instrument face value $ 750      
Debt instrument interest rate stated percentage 8.00%      
Proceeds from issuance of debt $ 743      
Redemption price of debt instrument (as a percent) 100.00%      
Subsequent Event | 9.00% Senior Notes due July 2023        
Subsequent events        
Debt instrument interest rate stated percentage 9.00%      
Aggregate cash payment $ 767      
Aggregate net loss $ (66)