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Partnerships and Joint Ventures - Ownership and Receivables (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Mar. 31, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
COOEC Fluor Heavy Industries Co., Ltd. |  |  |  |
Variable interest entity information |  |  |  |
Capital contribution | $ 26 |  |  |
COOEC Fluor Heavy Industries Co., Ltd. |  |  |  |
Variable interest entity information |  |  |  |
Ownership percentage |  | 49.00% |  |
SACYR | Discontinued Operations, Disposed of by Sale | Urban Solutions |  |  |  |
Variable interest entity information |  |  |  |
Ownership percentage |  | 10.00% |  |
Loss on sale of investment |  | $ 20 |  |
SACYR | Discontinued Operations, Disposed of by Sale | Energy & Chemicals |  |  |  |
Variable interest entity information |  |  |  |
Ownership percentage |  |  | 50.00% |
Loss on sale of investment |  |  | $ 11 |
Accounts and notes receivable, net | Variable Interest Entity, Not Primary Beneficiary |  |  |  |
Variable interest entity information |  |  |  |
Receivables related to work performed for unconsolidated partnerships and joint ventures |  | $ 216 |  | $ 207
Partnership | Minority Interest Ownership Percentage by Parent | Majority |  |  |  |
Variable interest entity information |  |  |  |
Entity's interest in partnership or joint venture (as a percent) |  | 50.00% |  |

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