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Debt (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Apr. 30, 2024
--- | --- | --- | --- | --- | ---
Principal amount |  |  |  |  |
Total principal amount of debt | $ 6,297 | $ 6,944 |  |  |
Debt due within one year | 1,390 | 714 |  |  |
Long-term debt | 4,907 | 6,230 |  |  |
Carrying amount |  |  |  |  |
Total debt | 6,221 | 6,881 |  |  |
Debt due within one year | 1,372 | 686 |  |  |
Long-term debt | 4,849 | 6,195 |  |  |
4.00% Senior Guaranteed Exchangeable Bonds due December 2025 |  |  |  |  |
Principal amount |  |  |  |  |
Total principal amount of debt | 37 | 234 |  |  |
Debt due within one year | 37 | 234 |  |  |
Carrying amount |  |  |  |  |
Total debt | 37 | 227 |  |  |
Debt due within one year | $ 37 | 227 |  |  |
Debt instrument interest rate stated percentage | 4.00% |  |  |  |
6.875% Senior Secured Notes due February 2027 |  |  |  |  |
Principal amount |  |  |  |  |
Total principal amount of debt | $ 248 | 330 |  |  |
Debt due within one year | 248 | 83 |  |  |
Carrying amount |  |  |  |  |
Total debt | 247 | 328 |  |  |
Debt due within one year | $ 247 | 82 |  |  |
Debt instrument interest rate stated percentage | 6.875% |  |  |  |
8.00% Senior Notes due February 2027 |  |  |  |  |
Principal amount |  |  |  |  |
Total principal amount of debt | $ 655 | 655 |  |  |
Debt due within one year | 655 |  |  |  |
Carrying amount |  |  |  |  |
Total debt | 654 | 653 |  |  |
Debt due within one year | $ 654 |  |  |  |
Debt instrument interest rate stated percentage | 8.00% |  | 8.00% | 8.00% |
7.45% Notes due April 2027 |  |  |  |  |
Principal amount |  |  |  |  |
Total principal amount of debt | $ 52 | 52 |  |  |
Carrying amount |  |  |  |  |
Total debt | $ 52 | 52 |  |  |
Debt instrument interest rate stated percentage | 7.45% |  |  |  |
8.00% Debentures due April 2027 |  |  |  |  |
Principal amount |  |  |  |  |
Total principal amount of debt | $ 22 | 22 |  |  |
Carrying amount |  |  |  |  |
Total debt | $ 22 | 22 |  |  |
Debt instrument interest rate stated percentage | 8.00% |  |  |  |
4.50% Shipyard Loans due September 2027 |  |  |  |  |
Principal amount |  |  |  |  |
Total principal amount of debt | $ 239 | 329 |  |  |
Debt due within one year | 128 | 120 |  |  |
Carrying amount |  |  |  |  |
Total debt | 229 | 310 |  |  |
Debt due within one year | $ 120 | 108 |  |  |
Debt instrument interest rate stated percentage | 4.50% |  |  |  |
8.375% Senior Secured Notes due February 2028 |  |  |  |  |
Principal amount |  |  |  |  |
Total principal amount of debt | $ 425 | 525 |  |  |
Debt due within one year | 135 | 100 |  |  |
Carrying amount |  |  |  |  |
Total debt | 420 | 518 |  |  |
Debt due within one year | $ 132 | 97 |  |  |
Debt instrument interest rate stated percentage | 8.375% |  |  |  |
7.00% Notes due June 2028 |  |  |  |  |
Principal amount |  |  |  |  |
Total principal amount of debt | $ 261 | 261 |  |  |
Carrying amount |  |  |  |  |
Total debt | $ 263 | 263 |  |  |
Debt instrument interest rate stated percentage | 7.00% |  |  |  |
8.00% Senior Secured Notes due September 2028 |  |  |  |  |
Principal amount |  |  |  |  |
Total principal amount of debt | $ 235 | 295 |  |  |
Debt due within one year | 70 | 60 |  |  |
Carrying amount |  |  |  |  |
Total debt | 233 | 292 |  |  |
Debt due within one year | $ 69 | 59 |  |  |
Debt instrument interest rate stated percentage | 8.00% |  |  |  |
8.25% Senior Notes due May 2029 |  |  |  |  |
Principal amount |  |  |  |  |
Total principal amount of debt | $ 900 | 900 |  |  |
Carrying amount |  |  |  |  |
Total debt | $ 889 | 887 |  |  |
Debt instrument interest rate stated percentage | 8.25% |  |  |  | 8.25%
4.625% Senior Guaranteed Exchangeable Bonds due September 2029 |  |  |  |  |
Principal amount |  |  |  |  |
Total principal amount of debt | $ 259 | 259 |  |  |
Carrying amount |  |  |  |  |
Total debt | $ 246 | 286 |  |  |
Debt instrument interest rate stated percentage | 4.625% |  |  |  |
8.75% Senior Secured Notes due February 2030 |  |  |  |  |
Principal amount |  |  |  |  |
Total principal amount of debt | $ 881 | 999 |  |  |
Debt due within one year | 117 | 117 |  |  |
Carrying amount |  |  |  |  |
Total debt | 866 | 981 |  |  |
Debt due within one year | $ 113 | 113 |  |  |
Debt instrument interest rate stated percentage | 8.75% |  |  |  |
7.50% Notes due April 2031 |  |  |  |  |
Principal amount |  |  |  |  |
Total principal amount of debt | $ 396 | 396 |  |  |
Carrying amount |  |  |  |  |
Total debt | $ 395 | 395 |  |  |
Debt instrument interest rate stated percentage | 7.50% |  |  |  |
8.50% Senior Notes due May 2031 |  |  |  |  |
Principal amount |  |  |  |  |
Total principal amount of debt | $ 900 | 900 |  |  |
Carrying amount |  |  |  |  |
Total debt | $ 887 | 886 |  |  |
Debt instrument interest rate stated percentage | 8.50% |  |  |  | 8.50%
6.80% Senior Notes due March 2038 |  |  |  |  |
Principal amount |  |  |  |  |
Total principal amount of debt | $ 610 | 610 |  |  |
Carrying amount |  |  |  |  |
Total debt | $ 605 | 605 |  |  |
Debt instrument interest rate stated percentage | 6.80% |  |  |  |
7.35% Senior Notes due December 2041 |  |  |  |  |
Principal amount |  |  |  |  |
Total principal amount of debt | $ 177 | 177 |  |  |
Carrying amount |  |  |  |  |
Total debt | $ 176 | $ 176 |  |  |
Debt instrument interest rate stated percentage | 7.35% |  |  |  |

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