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Contract Assets and Liabilities (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Contract assets      
Unbilled receivables - reimbursable contracts $ 872   $ 854
Contract work in progress - lump-sum contracts 104   137
Contract assets 976   991
Information about contract liabilities:      
Revenue recognized that was included in contract liabilities as of January 1 430 $ 471  
Claim revenue for costs 685   531
Construction contract cost, subcontractor $ 23   $ 24