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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

X
- 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: |