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Significant Accounting Policies (Schedule of Revenue and Receivables from Major Customers) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenue, Major Customer [Line Items]
Accounts receivable, net	$ 1,411	$ 899
U.S. government | Revenue Benchmark | Customer Concentration Risk
Revenue, Major Customer [Line Items]
Revenues	$ 5,122	$ 3,079	$ 3,014
Concentration risk, percentage	70.00%	53.00%	53.00%
U.S. government | Accounts Receivable | Customer Concentration Risk
Revenue, Major Customer [Line Items]
Accounts receivable, net	$ 1,062	$ 501
Concentration risk, percentage	75.00%	56.00%
U.K. government | Revenue Benchmark | Customer Concentration Risk
Revenue, Major Customer [Line Items]
Revenues	$ 508	$ 573	$ 659
Concentration risk, percentage	7.00%	10.00%	12.00%
U.K. government | Accounts Receivable | Customer Concentration Risk
Revenue, Major Customer [Line Items]
Accounts receivable, net	$ 81	$ 47
Concentration risk, percentage	6.00%	5.00%

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