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U.S. Government Matters (Details) $ in Millions		1 Months Ended	12 Months Ended
	Jul. 09, 2019 USD ($)	Jan. 31, 2014 subcontractor defendent	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Mar. 31, 2011 USD ($)
United States Government Contract Work [Line Items]
Cost of revenues			$ 4,986	$ 4,329	$ 3,732
Government Services
United States Government Contract Work [Line Items]
Billed costs			80
Cost of revenues			52
Government contract receivable			28	73
Total amount of payments withheld from subcontractors as result of disapproved costs related to Dcaa form 1 issued to enterprise			26
Reserve for Potentially Disallowable Costs Incurred under Government Contracts
United States Government Contract Work [Line Items]
Provision for doubtful accounts			41	41
Reserve for Potentially Disallowable Costs Incurred under Government Contracts | Contract Liabilities
United States Government Contract Work [Line Items]
Provision for doubtful accounts			26	26
Reserve for Potentially Disallowable Costs Incurred under Government Contracts | Other Liabilities
United States Government Contract Work [Line Items]
Provision for doubtful accounts			15	$ 15
Private Security
United States Government Contract Work [Line Items]
Billed costs			57
Government contract receivable			44
Awarded interest, revenue recognized	$ 13
First Kuwaiti Trading Company Arbitration
United States Government Contract Work [Line Items]
Damages awarded, value			17
Accounts payable			32
Payments on contract work			19
First Kuwaiti Trading Company Arbitration | Other Current Liabilities | Pay-When-Paid Terms
United States Government Contract Work [Line Items]
Payments on contract work			$ 30
Howard qui tam
United States Government Contract Work [Line Items]
Loss contingency, estimate of possible loss						$ 628
DOJFCA
United States Government Contract Work [Line Items]
Number of subcontractors | subcontractor		2
Loss contingency, number of defendants | defendent		3

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