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Significant Accounting Policies (Schedule of Other Current Assets) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2018
Accounting Policies [Abstract]      
Prepaid expenses $ 65 $ 49  
Value-added tax receivable 37 29  
Advances to subcontractors 20 5  
Other miscellaneous assets 24 25  
Total other current assets $ 146 $ 108 $ 98