Unapproved Change Orders and Claims Against Clients and Estimated Recoveries of Claims Against Suppliers and Subcontractors (Schedule of Unapproved Change Orders and Claims) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Unapproved Change Orders [Roll Forward]
Amounts included in project estimates-at-completion at January 1,	$ 973	$ 924
Increase, net of foreign currency effect	12	53
Approved change orders, net of foreign currency effect	(7)	(4)
Amounts included in project estimates-at-completion at December 31,	978	973
Amounts recognized over time based on progress at December 31,	$ 974	$ 945