Contract Assets and Liabilities (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Contract assets
Unbilled receivables - reimbursable contracts	$ 804		$ 822
Contract work in progress - lump-sum contracts	208		244
Contract assets	1,012		1,066
Advance billings deducted from contract assets	219		$ 208
Information about contract liabilities:
Revenue recognized that was included in contract liabilities as of January 1	$ 812	$ 882