Nature of Business and Basis of Presentation - Presentation Adjustments Related to Capitalized Contract Costs (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Reclassification [Line Items]
Cost of operations (excluding depreciation and amortization shown below)	$ 7,239	$ 6,406	$ 17,229	$ 20,137
Depreciation and amortization	352	359	1,045	921
Selling, general and administrative costs	$ 645	602	1,739	1,502
Amortization of capitalized contract costs			231	108
Changes in other working capital			$ (1,021)	(1,093)
As Previously Presented
Reclassification [Line Items]
Cost of operations (excluding depreciation and amortization shown below)		6,421		20,161
Depreciation and amortization		308		813
Selling, general and administrative costs		638		1,586
Amortization of capitalized contract costs				0
Changes in other working capital				(985)
Presentation Adjustments \| Reclassification, Other
Reclassification [Line Items]
Cost of operations (excluding depreciation and amortization shown below)		(15)		(24)
Depreciation and amortization		51		108
Selling, general and administrative costs		$ (36)		(84)
Amortization of capitalized contract costs				108
Changes in other working capital				$ (108)

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

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