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Taxation - Changes to Uncertain Tax Positions, Excluding Interest and Penalties (Details) - USD ($) $ in Millions	6 Months Ended		12 Months Ended
	Dec. 31, 2018	Jul. 01, 2018	Dec. 31, 2020	Dec. 31, 2019
Changes to liabilities related to unrecognized tax benefits, excluding interest and penalties [Roll Forward]
Balance at the beginning of the period	$ 61	$ 55	$ 89	$ 132
Increases as a result of positions taken in prior periods	69	7	1	8
Increases as a result of positions taken during the current period	18	1	0	29
Decreases as a result of positions taken in prior periods	(9)	(2)	(4)	(34)
Decreases due to settlements	(7)	0	(1)	(46)
Decreases as a result of a lapse of the applicable statute of limitations	0	0	(3)	0
Balance at the end of the period	$ 132	$ 61	$ 82	$ 89

X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

Amount of unrecognized tax benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 45
-Paragraph 10B
-URI http://asc.fasb.org/extlink&oid=120406818&loc=SL37586934-109318

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- Definition

Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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-Name Accounting Standards Codification
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Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities.

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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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