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Summary of Significant Accounting Policies - Narrative (Details) - USD ($) shares in Millions	12 Months Ended
	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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