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Debt (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Jan. 17, 2020
Dec. 31, 2019
Feb. 01, 2019
Principal amount        
Total principal amount of debt $ 9,246   $ 9,361  
Debt due within one year 595   581  
Long-term debt 8,651   8,780  
Carrying amount        
Total debt 9,157   9,261  
Debt due within one year 581   568  
Long-term debt 8,576   8,693  
6.50% Senior Notes due November 2020        
Principal amount        
Total principal amount of debt 198   206  
Debt due within one year 198   206  
Carrying amount        
Total debt 198   206  
Debt due within one year $ 198   206  
Debt instrument interest rate stated percentage 6.50%      
6.375% Senior Notes due December 2021        
Principal amount        
Total principal amount of debt $ 184   222  
Carrying amount        
Total debt $ 184   221  
Debt instrument interest rate stated percentage 6.375%      
5.52% Senior Notes due May 2022        
Principal amount        
Total principal amount of debt $ 178   200  
Debt due within one year 89   88  
Carrying amount        
Total debt 176   198  
Debt due within one year $ 88   87  
Debt instrument interest rate stated percentage 5.52%      
3.80% Senior Notes due October 2022        
Principal amount        
Total principal amount of debt $ 187   190  
Debt due within one year 5      
Carrying amount        
Total debt 186   189  
Debt due within one year $ 5      
Debt instrument interest rate stated percentage 3.80%      
0.50% Exchangeable Bonds due January 2023        
Principal amount        
Total principal amount of debt $ 863   863  
Carrying amount        
Total debt $ 862   862  
Debt instrument interest rate stated percentage 0.50%      
5.375% Senior Secured Notes due May 2023        
Principal amount        
Total principal amount of debt $ 519   525  
Debt due within one year 32   16  
Carrying amount        
Total debt 513   518  
Debt due within one year $ 29   14  
Debt instrument interest rate stated percentage 5.375%      
9.00% Senior Notes due July 2023        
Principal amount        
Total principal amount of debt     714  
Carrying amount        
Total debt     701  
Debt instrument interest rate stated percentage 9.00%      
5.875% Senior Secured Notes due January 2024        
Principal amount        
Total principal amount of debt $ 626   667  
Debt due within one year 83   83  
Carrying amount        
Total debt 616   656  
Debt due within one year $ 79   79  
Debt instrument interest rate stated percentage 5.875%      
7.75% Senior Secured Notes due October 2024        
Principal amount        
Total principal amount of debt $ 420   420  
Debt due within one year 60   60  
Carrying amount        
Total debt 412   412  
Debt due within one year $ 58   58  
Debt instrument interest rate stated percentage 7.75%      
6.25% Senior Notes due December 2024        
Principal amount        
Total principal amount of debt $ 437   437  
Debt due within one year 62   62  
Carrying amount        
Total debt 430   430  
Debt due within one year $ 60   60  
Debt instrument interest rate stated percentage 6.25%      
6.125% Senior Secured Notes due August 2025        
Principal amount        
Total principal amount of debt $ 501   534  
Debt due within one year 66   66  
Carrying amount        
Total debt 492   525  
Debt due within one year $ 64   64  
Debt instrument interest rate stated percentage 6.125%      
7.25% Senior Notes due November 2025        
Principal amount        
Total principal amount of debt $ 750   750  
Carrying amount        
Total debt $ 738   737  
Debt instrument interest rate stated percentage 7.25%      
7.50% Senior Notes due January 2026        
Principal amount        
Total principal amount of debt $ 750   750  
Carrying amount        
Total debt $ 743   743  
Debt instrument interest rate stated percentage 7.50%      
6.875% Senior Secured Notes due February 2027        
Principal amount        
Total principal amount of debt $ 550   550  
Carrying amount        
Total debt $ 541   541  
Debt instrument interest rate stated percentage 6.875%     6.875%
8.00% Senior Unsecured Notes due February 2027        
Principal amount        
Total principal amount of debt $ 750      
Carrying amount        
Total debt $ 743      
Debt instrument interest rate stated percentage 8.00% 8.00%    
7.45% Notes due April 2027        
Principal amount        
Total principal amount of debt $ 88   88  
Carrying amount        
Total debt $ 86   86  
Debt instrument interest rate stated percentage 7.45%      
8.00% Debentures due April 2027        
Principal amount        
Total principal amount of debt $ 57   57  
Carrying amount        
Total debt $ 57   57  
Debt instrument interest rate stated percentage 8.00%      
7.00% Notes due June 2028        
Principal amount        
Total principal amount of debt $ 300   300  
Carrying amount        
Total debt $ 306   306  
Debt instrument interest rate stated percentage 7.00%      
7.50% Notes due April 2031        
Principal amount        
Total principal amount of debt $ 588   588  
Carrying amount        
Total debt $ 585   585  
Debt instrument interest rate stated percentage 7.50%      
6.80% Senior Notes due March 2038        
Principal amount        
Total principal amount of debt $ 1,000   1,000  
Carrying amount        
Total debt $ 992   991  
Debt instrument interest rate stated percentage 6.80%      
7.35% Senior Notes due December 2041        
Principal amount        
Total principal amount of debt $ 300   300  
Carrying amount        
Total debt $ 297   $ 297  
Debt instrument interest rate stated percentage 7.35%