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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 |  |

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