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Income Taxes Income Taxes (Components of Foreign Income Tax Provision) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Operating Loss Carryforwards [Line Items]      
Foreign provision for income taxes $ (66) $ (76) $ (30)
United Kingdom      
Operating Loss Carryforwards [Line Items]      
Foreign provision for income taxes (19) (32) (7)
Australia      
Operating Loss Carryforwards [Line Items]      
Foreign provision for income taxes (6) (8) 6
Canada      
Operating Loss Carryforwards [Line Items]      
Foreign provision for income taxes (1) (6) 0
Middle East      
Operating Loss Carryforwards [Line Items]      
Foreign provision for income taxes (20) (16) (10)
Africa      
Operating Loss Carryforwards [Line Items]      
Foreign provision for income taxes (1) (1) 1
Other      
Operating Loss Carryforwards [Line Items]      
Foreign provision for income taxes $ (19) $ (13) $ (20)