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Current expected credit losses - Classification of Credit Loss Expense (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Accounts Receivable, Noncurrent, Past Due [Line Items]
Credit loss expense	$ 60	$ 63
Management contract expenses
Accounts Receivable, Noncurrent, Past Due [Line Items]
Credit loss expense	48	50
Other financial items
Accounts Receivable, Noncurrent, Past Due [Line Items]
Credit loss expense	$ 12	$ 13

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+ References

No definition available.

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- Definition

Amount of expense (reversal of expense) for expected credit loss on accounts receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(5))
-URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227

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