Major Accounting Policies - Engineering and Construction Contracts (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Engineering and Construction Contracts
Advances on contract work in progress	$ 343	$ 471

Represents the amount of progress payments offset against unbilled contract receivables.

No definition available.

Name:	flr_ContractReceivableProgressPaymentsOffset
Namespace Prefix:	flr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant