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Partnerships and Joint Ventures - Joint Venture Investment Agreement (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)
COOEC Fluor
Commitments
Ownership interest (as a percent)	49.00%
Sacyr Fluor | Discontinued Operations, Disposed of by Sale | Energy & Chemicals
Commitments
Ownership interest (as a percent)	50.00%
Gain (loss) on sale of investments	$ (11)
COOEC Fluor
Commitments
Future funding commitments	$ 26

X

- Definition

The net realized gain (loss) on investments sold during the period, not including gains (losses) on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, which, for cash flow reporting, is a component of proceeds from investing activities.

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Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions.

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- Definition

Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

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