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Income Taxes (Components of Income (Loss) before Income Tax) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Operating Loss Carryforwards [Line Items]      
United States $ 2 $ 44 $ 84
Foreign 266 352 163
Total 268 396 247
United Kingdom      
Operating Loss Carryforwards [Line Items]      
Foreign 105 203 40
Australia      
Operating Loss Carryforwards [Line Items]      
Foreign 15 7 (30)
Canada      
Operating Loss Carryforwards [Line Items]      
Foreign 3 (2) 15
Middle East      
Operating Loss Carryforwards [Line Items]      
Foreign 87 61 42
Africa      
Operating Loss Carryforwards [Line Items]      
Foreign 5 13 20
Other      
Operating Loss Carryforwards [Line Items]      
Foreign $ 51 $ 70 $ 76