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Leases - Lease Costs (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Leases [Abstract]      
Operating lease costs $ 89 $ 103 $ 88
Amortization of right-of-use assets, financing leases 24 22 500
Interest expense for financing lease liabilities 3 24 38
Total financing lease costs 27 46 538
Short term lease costs 0 13 2
Variable lease costs 22 42 113
Operating cash flows used in operating leases (71) (78) (93)
Operating cash flows used in financing leases (3) (19) (39)
Financing cash flows used in financing leases (23) (12) (292)
Decrease in right-of-use assets related to lease modifications and reassessments (10) (4) (67)
Right-of-use assets obtained in exchange for operating lease liabilities 0 100 714
Decrease in right-of-use assets related to lease modifications and reassessments 0 (425) (213)
Right-of-use assets obtained in exchange for financing lease liabilities 0 75 0
Changes in financing lease liabilities (5) 2 3
Lease liability derecognized upon purchase of underlying leased asset $ 0 $ 579 $ 0
Operating leases, remaining lease term 12 years 13 years  
Finance leases, remaining lease term 2 years 3 years  
Operating leases, discount rate 7.60% 7.60%  
Finance leases, discount rate 5.90% 5.90%