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Contract Assets and Liabilities (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Contract assets
Unbilled receivables - reimbursable contracts	$ 1,394		$ 1,050
Contract work in progress - lump-sum contracts	95		88
Contract assets	1,489		1,138
Information about contract liabilities:
Revenue recognized that was included in contract liabilities as of January 1	481	$ 430
Claim revenue for costs	233		244
Construction contract cost, subcontractor	$ 85		$ 23

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