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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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Current portion before unamortized (discount) premium and debt issuance costs, of long-term debt.

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