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Taxation - Income Tax Reconciliation (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Dec. 31, 2018
Jul. 01, 2018
Dec. 31, 2019
Dec. 31, 2017
Income Tax Disclosure [Abstract]        
Income taxes at statutory rate $ 0 $ 0 $ 0 $ 0
Effect of change on unrecognized tax benefits 49 12 (6) (5)
Effect of unremitted earnings of subsidiaries (10) 0 (17) 3
Effect of taxable income in various countries (31) 18 (16) 68
Total tax (benefit)/expense $ 8 $ 30 $ (39) $ 66