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Debt Instruments - Long -Term Debt (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Aug. 15, 2025
Feb. 15, 2025
Aug. 15, 2024
Feb. 15, 2024
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Line of Credit Facility [Line Items]                  
Payment-in-kind interest expense             $ 182 $ 388  
Assets         $ 9,853   9,853   $ 8,484
Long-term debt, current maturities         319   319   302
Variable Interest Entity, Not Primary Beneficiary                  
Line of Credit Facility [Line Items]                  
Outstanding principal, net of debt issuance costs         365   365   351
Long-term debt, current maturities         147   147   136
Variable Interest Entity, Not Primary Beneficiary | Asset Pledged as Collateral                  
Line of Credit Facility [Line Items]                  
Assets         368   368   354
Leased Properties and Construction Improvements                  
Line of Credit Facility [Line Items]                  
Sale leaseback liability, net, included in long-term debt         482   $ 482   482
Minimum | Leased Properties and Construction Improvements                  
Line of Credit Facility [Line Items]                  
Sale leaseback transaction, expiration period             20 years    
Maximum | Leased Properties and Construction Improvements                  
Line of Credit Facility [Line Items]                  
Sale leaseback transaction, expiration period             25 years    
Sale leaseback transaction, renewal period (up to)             25 years    
Senior Notes                  
Line of Credit Facility [Line Items]                  
Outstanding principal, net of debt issuance costs         3,918   $ 3,918   4,345
Long-term debt, current maturities         98   98   $ 98
Notes due December 1, 2028 (the "2028 Senior Secured Notes") | Senior Notes                  
Line of Credit Facility [Line Items]                  
Payment-in-kind interest expense $ 25 $ 28 $ 47 $ 53          
Notes due June 1, 2030 (the "2030 Senior Secured Notes") | Senior Notes                  
Line of Credit Facility [Line Items]                  
Payment-in-kind interest expense 91 91 101 88          
Notes due June 1, 2031 (the "2031 Senior Secured Notes") | Senior Notes                  
Line of Credit Facility [Line Items]                  
Payment-in-kind interest expense $ 148 $ 139 $ 130 $ 111          
2028 Senior Secured Notes | Senior Notes                  
Line of Credit Facility [Line Items]                  
Payment-in-kind interest expense           $ 1 1 8  
Debt instrument, redeemed during period         559        
Redemption of senior debt         578        
Redemption premium         13        
Accrued interest, redemption         6        
Debt instrument, repurchased during period           100 52 350  
Repayments of senior debt           104 55 363  
Gain (loss) on debt extinguishment         (14) (4) (16) (6)  
Transaction fees, write offs and unamortized premium         $ 1 $ 1 $ 1 $ 1  
Senior Secured Notes | Senior Notes                  
Line of Credit Facility [Line Items]                  
Percent of principal amount outstanding         100.00%   100.00%    
Debt instrument, redemption price, percentage of principal amount redeemed             35.00%    
Debt instrument, redemption price, percentage             109.00%    
Percent of principal amount outstanding, change control events         101.00%   101.00%    
Senior Unsecured Notes | Senior Notes | Debt Instrument, Redemption, Period One                  
Line of Credit Facility [Line Items]                  
Debt instrument, redemption price, percentage of principal amount redeemed             35.00%    
Debt instrument, redemption price, percentage             100.00%    
Notes due May 1, 2030 ("2030 Senior Unsecured Notes") | Senior Notes | Debt Instrument, Redemption, Period One                  
Line of Credit Facility [Line Items]                  
Debt instrument, redemption price, percentage of principal amount redeemed             10.00%    
Debt instrument, redemption price, percentage             105.125%