Operating Information by Segment and Geographic Area - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Segment reporting information
Revenue	$ 3,752	$ 3,122
Disposal Group, Not Discontinued Operations | AMECO
Segment reporting information
Proceeds from divestiture of businesses	144
Cash divestiture	17
Loss on sale	60
AMECO divestiture, negative impact on earnings from foreign currency translation	$ 35
Fluor Corporation | NuScale | Disposal Group, Not Discontinued Operations
Segment reporting information
Entity's interest in partnership or joint venture (percent)	56.00%
Energy Solutions
Segment reporting information
Expense from embedded foreign currency derivatives	$ 39	13
Energy Solutions | Large LNG Project
Segment reporting information
Effect of forecast revision on estimated project cost	$ 22
Effect of forecast revision on estimated project cost (in dollars per share)	$ 0.09
Urban Solutions | LAX Automated People Mover project
Segment reporting information
Effect of forecast revision on estimated project cost	$ 59
Effect of forecast revision on estimated project cost (in dollars per share)	$ 0.34
Urban Solutions | Professional Staffing Business | Consolidation, Eliminations
Segment reporting information
Revenue	$ 69	$ 60
Mission Solutions | Weapons Facility Project
Segment reporting information
Effect of forecast revision on estimated project cost	$ 21
Effect of forecast revision on estimated project cost (in dollars per share)	$ 0.12