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Income Taxes - Differences in year-over-year earnings from continuing operations (Details) - Energy & Chemicals - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Effect of forecast revision on estimated project cost	$ 44
U.S.
Effect of forecast revision on estimated project cost	$ 260	$ 265

X

- Definition

Represents the increase (decrease) in the estimated project cost based on forecast revisions.

+ References

No definition available.

+ Details

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

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- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=flr_EnergyAndChemicalsSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementGeographicalAxis=country_US
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: