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Property and Equipment, net (Schedule Of Property And Equipment, Net) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Property, Plant and Equipment [Line Items] |  |  |
Estimated Useful Lives | 30 years |  |
Property and Equipment, gross | $ 3,781 | $ 3,820 |
Accumulated depreciation and amortization | (2,787) | (2,772) |
Property and equipment, net | 994 | 1,048 |
Finance Lease, Right-of-Use Asset, Accumulated Amortization | 16 | 13 |
Finance Lease, Right-of-Use Asset, Amortization | 5 | 4 | $ 4
Capitalized Computer Software, Amortization | 36 | 37 | $ 37
Buildings [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property and Equipment, gross | 736 | 769 |
Computer Equipment [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property and Equipment, gross | $ 811 | 794 |
Computer Equipment [Member] | Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated Useful Lives | 3 years |  |
Computer Equipment [Member] | Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated Useful Lives | 5 years |  |
Computer Software [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property and Equipment, gross | $ 1,024 | 1,007 |
Computer Software [Member] | Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated Useful Lives | 3 years |  |
Computer Software [Member] | Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated Useful Lives | 8 years |  |
Furniture and Equipment [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property and Equipment, gross | $ 716 | 733 |
Furniture and Equipment [Member] | Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated Useful Lives | 5 years |  |
Furniture and Equipment [Member] | Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated Useful Lives | 9 years |  |
Land [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property and Equipment, gross | $ 6 | 7 |
Capital Work-in-Progress [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property and Equipment, gross | 115 | 88 |
Leasehold Improvements [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property and Equipment, gross | $ 373 | $ 422 |

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