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Summary of Significant Accounting Policies - Property and Equipment (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Property and equipment      
Capitalized costs $ 349 $ 398  
Accumulated depreciation on property and equipment 2,340 2,500  
Depreciation expense $ 259 $ 316 $ 343
Equipment | Minimum      
Property and equipment      
Property and equipment, estimated useful life (in years) 3 years    
Equipment | Maximum      
Property and equipment      
Property and equipment, estimated useful life (in years) 10 years    
Software and Software Development Costs | Minimum      
Property and equipment      
Property and equipment, estimated useful life (in years) 3 years    
Software and Software Development Costs | Maximum      
Property and equipment      
Property and equipment, estimated useful life (in years) 5 years    
Real property      
Property and equipment      
Property and equipment, estimated useful life (in years) 40 years