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Contingencies and Commitments (Details) $ in Millions, $ in Millions			1 Months Ended		3 Months Ended		12 Months Ended
	Aug. 23, 2019 USD ($)	Dec. 13, 2016 AUD ($)	Dec. 31, 2020 USD ($)	Sep. 30, 2018 action	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Aug. 23, 2020 USD ($)	May 26, 2020 claim	Aug. 31, 2019 USD ($)	Aug. 12, 2016 USD ($)
Loss Contingencies [Line Items]
Number of derivative actions filed | action				10
Gains related to favorable dispute resolution					$ 18	$ 13
Claim revenue for costs			$ 216				$ 216	$ 198
Purple Line Transit Partners L L C
Loss Contingencies [Line Items]
Ownership interest								15.00%
Purple Line Transit Constructors, LLC
Loss Contingencies [Line Items]
Ownership interest								50.00%
Purple Line Transit Partners L L C | Purple Line Transit Project | Positive Outcome of Litigation
Loss Contingencies [Line Items]
Proceeds from Legal Settlements			116
Litigation Settlement, Account Receivable Awarded			150				$ 150
Fluor T E C H I N T | Barrick
Loss Contingencies [Line Items]
Letters of credit outstanding, amount											$ 36
Fluor T E C H I N T | Barrick | Parent Company
Loss Contingencies [Line Items]
Letters of credit outstanding, amount											24
Fluor T E C H I N T | Barrick | Partnership Interest
Loss Contingencies [Line Items]
Letters of credit outstanding, amount											$ 12
Purple Line Transit Project | Minimum
Loss Contingencies [Line Items]
Right to terminate contract, period								365 days
Project Design and Construction Delay, Events Outside Control, Period							2 years 6 months
D B Contract | Minimum
Loss Contingencies [Line Items]
Right to terminate contract, period								365 days
Pending litigation
Loss Contingencies [Line Items]
Number of pending matters | claim										1
Damages sought		$ 1,470
Pending litigation | Sadara Chemical Company
Loss Contingencies [Line Items]
Damages sought	$ 100
Estimate of possible loss									$ 574
Pending litigation | Fluor T E C H I N T
Loss Contingencies [Line Items]
Estimate of possible loss			$ 330				$ 330					$ 250

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