Other operating items (Details) - USD ($) $ in Millions	2 Months Ended	3 Months Ended	4 Months Ended	6 Months Ended
Feb. 22, 2022	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2022	Jun. 30, 2023
Other Income and Expenses [Abstract]
Gain on disposals	$ 2	$ 3	$ 0	$ 0	$ 7
Total other operating items	$ 2	$ 3	$ 0	$ 0	$ 7

Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585

Name:	us-gaap_GainLossOnDispositionOfAssets1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration