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Income Taxes (Components of Foreign Income Tax Provision) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Operating Loss Carryforwards [Line Items]      
Foreign provision for income taxes $ (71) $ (51) $ (66)
United Kingdom      
Operating Loss Carryforwards [Line Items]      
Foreign provision for income taxes (22) (14) (19)
Australia      
Operating Loss Carryforwards [Line Items]      
Foreign provision for income taxes (23) (6) (6)
Canada      
Operating Loss Carryforwards [Line Items]      
Foreign provision for income taxes 0 (1) (1)
Middle East      
Operating Loss Carryforwards [Line Items]      
Foreign provision for income taxes (9) (18) (20)
Africa      
Operating Loss Carryforwards [Line Items]      
Foreign provision for income taxes 0 0 (1)
Other      
Operating Loss Carryforwards [Line Items]      
Foreign provision for income taxes $ (17) $ (12) $ (19)