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Other operating items - Other Operating Items (Details) - USD ($) $ in Millions		6 Months Ended		12 Months Ended
		Dec. 31, 2018	Jul. 01, 2018	Dec. 31, 2020	Dec. 31, 2019
Other Operating Income (Loss) [Abstract]
Impairment of long lived assets		$ 0	$ (414)	$ (4,087)	$ 0
Loss on impairment of intangibles		0	0	(21)	0
Gain on disposals		0	0	15	0
Other operating income	[1]	21	7	9	39
Total other operating items		$ 21	$ (407)	$ (4,084)	$ 39
[1] Includes transactions with related parties. Refer to Note 32 - "Related party transactions" for further details.

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Other Operating Income (Loss)

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Other Operating Income (Loss) [Abstract]

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Amount of gain (loss) on sale or disposal of property, plant and equipment assets, excluding oil and gas property and timber property.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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-Section 45
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Total loss recognized during the period from the impairment of goodwill plus the loss recognized in the period resulting from the impairment of the carrying amount of intangible assets, other than goodwill.

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The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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The total amount of other operating income, the components of which are not separately disclosed on the income statement, from items that are associated with the entity's normal revenue producing operation.

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