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Significant Accounting Policies (Schedule of Other Current Assets) (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Accounting Policies [Abstract]    
Prepaid expenses $ 75 $ 71
Value-added tax receivable 21 22
Advances to subcontractors 15 10
Other miscellaneous assets 36 18
Total other current assets $ 147 $ 121