Nature of Business and Basis of Presentation - Presentation Adjustments Related to Capitalized Contract Costs (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Reclassification [Line Items]
Cost of operations (excluding depreciation and amortization shown below)	$ 5,629	$ 4,328	$ 12,190	$ 9,990
Depreciation and amortization	344	360	670	693
Selling, general and administrative costs	$ 724	545	1,273	1,094
Amortization of capitalized contract costs			226	140
Changes in other working capital			$ (529)	(851)
As Previously Presented
Reclassification [Line Items]
Cost of operations (excluding depreciation and amortization shown below)		4,356		10,041
Depreciation and amortization		285		553
Selling, general and administrative costs		592		1,183
Amortization of capitalized contract costs				0
Changes in other working capital				(711)
Presentation Adjustments \| Reclassification, Other
Reclassification [Line Items]
Cost of operations (excluding depreciation and amortization shown below)		(28)		(51)
Depreciation and amortization		75		140
Selling, general and administrative costs		$ (47)		(89)
Amortization of capitalized contract costs				140
Changes in other working capital				$ (140)

Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer.

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