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Remaining Unsatisfied Performance Obligations - Narrative (Details) $ in Billions | 9 Months Ended
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Sep. 30, 2021 USD ($)
Energy Solutions | North America |
Segment Reporting Information [Line Items] |
Decrease in remaining unsatisfied performance obligation from cancelled project | $ 2

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- Definition Decrease in Remaining Unsatisfied Performance Obligations From Project Cancellation + References No definition available. + Details
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Namespace Prefix: | flr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=flr_EnergySolutionsSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_StatementGeographicalAxis=srt_NorthAmericaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |