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Other Comprehensive Income (Loss) - Changes in AOCI Balances by Component (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Changes in AOCI balances by component (after-tax)        
Balance, beginning of year $ 1,970 $ 1,694 $ 1,996 $ 1,567
Total OCI, net of tax (26) (23) 37 (12)
Balance, end of year 2,022 1,923 2,022 1,923
Attributable to Fluor:        
Changes in AOCI balances by component (after-tax)        
Balance, beginning of year (302) (355) (365) (366)
OCI before reclassifications (28) (23) 33 (19)
Amounts reclassified from AOCI (1) 0 1 7
Total OCI, net of tax (29) (23) 34 (12)
Balance, end of year (331) (378) (331) (378)
Foreign Currency Translation        
Changes in AOCI balances by component (after-tax)        
Balance, beginning of year (263) (304) (328) (300)
OCI before reclassifications (28) (32) 37 (36)
Amounts reclassified from AOCI 0 0 0 0
Total OCI, net of tax (28) (32) 37 (36)
Balance, end of year (291) (336) (291) (336)
Ownership Share of Equity Method Investees’ OCI        
Changes in AOCI balances by component (after-tax)        
Balance, beginning of year (29) (38) (25) (56)
OCI before reclassifications 0 14 (4) 24
Amounts reclassified from AOCI 0 0 0 8
Total OCI, net of tax 0 14 (4) 32
Balance, end of year (29) (24) (29) (24)
Other        
Changes in AOCI balances by component (after-tax)        
Balance, beginning of year (10) (13) (12) (10)
OCI before reclassifications 0 (5) 0 (7)
Amounts reclassified from AOCI (1) 0 1 (1)
Total OCI, net of tax (1) (5) 1 (8)
Balance, end of year (11) (18) (11) (18)
Attributable to NCI:        
Changes in AOCI balances by component (after-tax)        
Balance, beginning of year (2) (2) (2) (3)
OCI before reclassifications 3 0 3 1
Amounts reclassified from AOCI 0 0 0 0
Total OCI, net of tax 3 0 3 1
Balance, end of year 1 (2) 1 (2)
Foreign Currency Translation        
Changes in AOCI balances by component (after-tax)        
Balance, beginning of year (2) (2) (2) (3)
OCI before reclassifications 3 0 3 1
Amounts reclassified from AOCI 0 0 0 0
Total OCI, net of tax 3 0 3 1
Balance, end of year 1 (2) 1 (2)
Ownership Share of Equity Method Investees’ OCI        
Changes in AOCI balances by component (after-tax)        
Balance, beginning of year 0 0 0 0
OCI before reclassifications 0 0 0 0
Amounts reclassified from AOCI 0 0 0 0
Total OCI, net of tax 0 0 0 0
Balance, end of year 0 0 0 0
Other        
Changes in AOCI balances by component (after-tax)        
Balance, beginning of year 0 0 0 0
OCI before reclassifications 0 0 0 0
Amounts reclassified from AOCI 0 0 0 0
Total OCI, net of tax 0 0 0 0
Balance, end of year $ 0 $ 0 $ 0 $ 0