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Summary of Significant Accounting Policies - Narrative (Details) - USD ($) shares in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Summary of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |
Contract assets | $ 220,000,000 | $ 227,000,000 |  |
Contract assets, noncurrent | 308,000,000 | 240,000,000 |  |
Impairment of intangible assets, finite-lived | 0 | 0 |  |
Impairment long lived asset held for use statement of income or comprehensive income extensible enumeration not disclosed flag |  |  | impairment losses |
Impairment of held for use assets | $ 0 | 0 | $ 71,000,000 |
Operating lease impairment loss |  | $ 0 | $ 43,000,000 | $ 0
Recognized compensation cost award service period | 3 years |  |  |
Purchase of common shares (in shares) |  | 2 | 3 |
Stock Options |  |  |  |
Summary of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |
Purchase of common shares (in shares) | 7 | 8 | 5 |
Buildings |  |  |  |
Summary of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |
Fixed asset, estimated useful life | 30 years |  |  |
Customer relationships |  |  |  |
Summary of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |
Intangible assets, estimated useful lives | 10 years |  |  |
Maximum |  |  |  |
Summary of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |
Lease renewal term | 5 years |  |  |
Maximum | Furniture and fixture |  |  |  |
Summary of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |
Fixed asset, estimated useful life | 7 years |  |  |
Maximum | Trademarks |  |  |  |
Summary of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |
Intangible assets, estimated useful lives | 5 years |  |  |
Maximum | Software |  |  |  |
Summary of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |
Intangible assets, estimated useful lives | 10 years |  |  |
Maximum | Internal-use software |  |  |  |
Summary of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |
Intangible assets, estimated useful lives | 10 years |  |  |
Maximum | Internally developed software |  |  |  |
Summary of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |
Intangible assets, estimated useful lives | 10 years |  |  |
Minimum |  |  |  |
Summary of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |
Lease renewal term | 1 year |  |  |
Minimum | Furniture and fixture |  |  |  |
Summary of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |
Fixed asset, estimated useful life | 3 years |  |  |
Minimum | Software |  |  |  |
Summary of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |
Intangible assets, estimated useful lives | 1 year |  |  |
Minimum | Internal-use software |  |  |  |
Summary of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |
Intangible assets, estimated useful lives | 3 years |  |  |
Minimum | Internally developed software |  |  |  |
Summary of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |
Intangible assets, estimated useful lives | 3 years |  |  |

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