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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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- Definition

The gross amount of increases in unrecognized tax benefits resulting from tax positions taken in prior period tax returns, excluding amounts pertaining to examined tax returns.

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Amount of current and deferred foreign income tax expense (benefit) attributable to income (loss) from continuing operations.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to equity in earnings (loss) of unconsolidated subsidiaries exempt from income taxes.

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