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

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- 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