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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, 2020 | Dec. 31, 2019
Income Tax Disclosure [Abstract] |  |  |  |
Effect of change on unrecognized tax benefits | $ 49 | $ 12 | $ (1) | $ (6)
Effect of unremitted earnings of subsidiaries | (10) | 0 | (2) | (17)
Effect of taxable income in various countries | (31) | 18 | 8 | (16)
Total tax expense/(benefit) | $ 8 | $ 30 | $ 5 | $ (39)

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