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Leases (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2024
Sep. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Leases [Line Items]        
Long-term debt   $ 7,407   $ 6,885
Facility Lease        
Leases [Line Items]        
Right-of-use asset   762    
Lease liability   762    
Right-of-use asset, tax incentive   $ 181    
Lease term (in years)   5 years    
Lease liability   $ 49    
Long-term debt   713    
Finance lease liability, to be paid   1,000    
Finance lease liability, to be paid year one   74    
Finance lease liability, to be paid year two   88    
Finance lease liability, to be paid year three   88    
Finance lease liability, to be paid year four   88    
Finance lease liability, to be paid after year four   $ 676    
Financing Lease, Lease Not yet Commenced        
Leases [Line Items]        
Operating lease not yet commenced     $ 261  
Finance lease not yet commenced term of contract (in years)   16 years    
Financing Lease, Lease Not yet Commenced | Equipment Lease        
Leases [Line Items]        
Operating lease not yet commenced   $ 717    
Finance lease not yet commenced term of contract (in years)   5 years    
Estimated purchase and installation costs $ 365 $ 586    
Estimated undiscounted lease payments year one   75    
Estimated undiscounted lease payments year two   151    
Estimated undiscounted lease payments year three   151    
Estimated undiscounted lease payments year four   151    
Estimated undiscounted lease payments after year four   $ 189