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v3.19.3

Remaining Unsatisfied Performance Obligations - Narrative (Details) $ in Billions | Sep. 30, 2019 USD ($)
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Revenue from Contract with Customer [Abstract] |
Performance obligation discontinued | $ 4

X
- Definition Performance Obligation Discontinued + References No definition available. + Details
Name: | flr_PerformanceObligationDiscontinued
Namespace Prefix: | flr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_RevenueFromContractWithCustomerAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration