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Major Accounting Policies - Engineering and Construction Contracts (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Engineering and Construction Contracts
Advances on contract work in progress	$ 337	$ 382

X

- Definition

Represents the amount of progress payments offset against unbilled contract receivables.

+ References

No definition available.

+ Details

Name:	flr_ContractReceivableProgressPaymentsOffset
Namespace Prefix:	flr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- References

No definition available.

+ Details

Name:	us-gaap_LiabilitiesForLongTermContractsOrProgramsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration