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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% |  |  |

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