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Current expected credit losses - Classification of Credit Loss Expense (Details) - USD ($) $ in Millions | 6 Months Ended
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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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- 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 + Details
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