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Business Segment Information (Schedule of Balance Sheet Information by Reportable Segment) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Total Assets	$ 6,199	$ 5,705
Goodwill	2,060	1,761	$ 1,265
Equity in and advances to related companies	576	881
Government Solutions
Segment Reporting Information [Line Items]
Total Assets	4,245	3,379
Goodwill	1,890	1,589	978
Equity in and advances to related companies	126	145
Sustainable Technology Solutions
Segment Reporting Information [Line Items]
Total Assets	1,145	1,440
Goodwill	170	172	$ 287
Equity in and advances to related companies	450	736
Other
Segment Reporting Information [Line Items]
Total Assets	$ 809	$ 886

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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