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Summary of Significant Accounting Policies - Narrative (Details) - USD ($) shares in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Jan. 31, 2024
Summary of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |
Contract assets | $ 227 | $ 207 |  |
Contract assets, noncurrent | 240 | $ 122 |  |
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 |  | $ 71 |  |
Operating lease impairment loss | $ 0 | $ 43 | $ 0 |
Recognized compensation cost award service period | 3 years |  |  |
Purchase of common shares (in shares) (current year less than) | 2 | 3 |  |
Stock Options |  |  |  |
Summary of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |
Purchase of common shares (in shares) (current year less than) | 8 | 5 | 2 |
Subsequent Event |  |  |  |
Summary of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |
Equity security investment |  |  |  | $ 30
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 |  |  |
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 | Internally developed software |  |  |  |
Summary of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |
Intangible assets, estimated useful lives | 3 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 | Internally developed software |  |  |  |
Summary of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |
Intangible assets, estimated useful lives | 10 years |  |  |

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