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Property and Equipment, net (Narrative) (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Finance Lease, Right-of-Use, before Accumulated Amortization | $ 30,000,000 | $ 25,000,000 |
Finance Lease, Right-of-Use Asset, Accumulated Amortization | 16,000,000 | 13,000,000 |
Finance Lease, Right-of-Use Asset, Amortization | 5,000,000 | 4,000,000 | $ 4,000,000
Capitalized Computer Software, Accumulated Amortization | 210,000,000 | 177,000,000 |
Capitalized Computer Software, Amortization | 36,000,000 | 37,000,000 | 37,000,000
Capitalized Computer Software, Gross | 338,000,000 | 279,000,000 |
Disposal Group, Held-for-Sale, Not Discontinued Operations |  |  |
Physical held for sale assets | 9,000,000 | 0 |
Facility exit costs | NextGen Program |  |  |
Accelerated depreciation | 13,000,000 | 36,000,000 |
Property, Plant and Equipment [Member] |  |  |
Depreciation | $ 354,000,000 | $ 390,000,000 | $ 385,000,000

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