v3.26.1
Debt (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Mar. 31, 2026
Mar. 30, 2026
Dec. 31, 2025
Principal amount        
Total principal amount of debt $ 5,107     $ 5,686
Debt due within one year 405     458
Long-term debt 4,702     5,228
Carrying amount        
Total debt 5,119     5,657
Debt due within one year 397     445
Long-term debt 4,722     5,212
7.45% Notes due April 2027        
Principal amount        
Total principal amount of debt 52     52
Debt due within one year 52      
Carrying amount        
Total debt 52     52
Debt due within one year $ 52      
Debt instrument interest rate stated percentage 7.45%      
8.00% Debentures due April 2027        
Principal amount        
Total principal amount of debt $ 22     22
Debt due within one year 22      
Carrying amount        
Total debt 22     22
Debt due within one year $ 22      
Debt instrument interest rate stated percentage 8.00%      
4.50% Shipyard Loans due September 2027        
Principal amount        
Total principal amount of debt $ 149     209
Debt due within one year 144     136
Carrying amount        
Total debt 145     202
Debt due within one year $ 140     129
Debt instrument interest rate stated percentage 4.50%      
8.375% Senior Secured Notes due February 2028        
Principal amount        
Total principal amount of debt       425
Debt due within one year       135
Carrying amount        
Total debt       421
Debt due within one year       133
Debt instrument interest rate stated percentage 8.375% 8.375%    
7.00% Notes due June 2028        
Principal amount        
Total principal amount of debt $ 209     209
Carrying amount        
Total debt $ 210     210
Debt instrument interest rate stated percentage 7.00%      
8.00% Senior Secured Notes due September 2028        
Principal amount        
Total principal amount of debt $ 200     235
Debt due within one year 70     70
Carrying amount        
Total debt 198     233
Debt due within one year $ 69     69
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 $ 891     889
Debt instrument interest rate stated percentage 8.25%      
4.625% Senior Guaranteed Exchangeable Bonds due September 2029        
Principal amount        
Total principal amount of debt $ 259     259
Carrying amount        
Total debt $ 320     292
Debt instrument interest rate stated percentage 4.625%   4.625%  
8.75% Senior Secured Notes due February 2030        
Principal amount        
Total principal amount of debt $ 822     881
Debt due within one year 117     117
Carrying amount        
Total debt 811     868
Debt due within one year $ 114     114
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 $ 889     888
Debt instrument interest rate stated percentage 8.50%      
7.875% Senior Guaranteed Notes due October 2032        
Principal amount        
Total principal amount of debt $ 500     500
Carrying amount        
Total debt $ 493     493
Debt instrument interest rate stated percentage 7.875%      
6.80% Senior Notes due March 2038        
Principal amount        
Total principal amount of debt $ 610     610
Carrying amount        
Total debt $ 606     605
Debt instrument interest rate stated percentage 6.80%      
7.35% Senior Notes due December 2041        
Principal amount        
Total principal amount of debt $ 88     88
Carrying amount        
Total debt $ 87     $ 87
Debt instrument interest rate stated percentage 7.35%