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v3.22.2.2

NuScale Reverse Recapitalization (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2022 | Sep. 30, 2022 | Sep. 30, 2021
Class of Warrant or Right [Line Items] |  |  |
Proceeds from NuScale de-SPAC transaction | $ 341 | $ 341 | $ 0
SMR warrants |  |  |
Class of Warrant or Right [Line Items] |  |  |
Warrants assumed | $ 48 |  |

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- Definition Proceeds From de-SPAC Transaction + 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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- Definition Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price. + References No definition available. + Details
Name: | us-gaap_WarrantsAndRightsOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | dei_LegalEntityAxis=flr_SMRWarrantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |