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U.S. Government Matters (Details)	1 Months Ended
	Jan. 31, 2014 defendant subcontractor	Apr. 30, 2008 USD ($)	Jun. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)	Mar. 31, 2011 USD ($)
Reserve For Potentially Disallowable Costs Incurred Under Government Contracts
United States Government Contract Work [Line Items]
Accrued reserve for unallowable costs			$ 33,000,000	$ 33,000,000
First Kuwaiti Trading Company Arbitration
United States Government Contract Work [Line Items]
Damages awarded, value		$ 17,000,000
Amount owed to subcontractor		$ 32,000,000
Howard qui tam
United States Government Contract Work [Line Items]
Estimate of possible loss					$ 628,000,000
Amount accrued			$ 0
DOJFCA
United States Government Contract Work [Line Items]
Number of subcontractors | subcontractor	2
Number of defendants | defendant	3

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