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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

X

- Definition

Proceeds From de-SPAC Transaction

+ References

No definition available.

+ Details

Name:	flr_ProceedsFromDeSPACTransaction
Namespace Prefix:	flr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- 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

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

X

- 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

X

- Details

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