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Current expected credit losses - Allowance for Credit Losses and Credit Loss Expense (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Jul. 01, 2018 | Dec. 31, 2020 | Dec. 31, 2019
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance |  |  | $ 143 |
Credit loss expense | $ 0 | $ 0 | 166 | $ 0
Ending balance |  |  | 309 | 143
Credit loss expense | $ 0 | $ 0 | 166 | 0
Management contract expenses |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Credit loss expense |  |  | 142 |
Credit loss expense |  |  | 142 |
Other financial items |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Credit loss expense |  |  | 24 |
Credit loss expense |  |  | 24 |
Trade receivables |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance |  |  | 0 |
Credit loss expense |  |  | 0 |
Ending balance |  |  | 0 | 0
Credit loss expense |  |  | 0 |
Other current assets |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance |  |  | 0 |
Credit loss expense |  |  | 3 |
Ending balance |  |  | 3 | 0
Credit loss expense |  |  | 3 |
Related party ST |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance |  |  | 15 |
Credit loss expense |  |  | 154 |
Ending balance |  |  | 169 | 15
Credit loss expense |  |  | 154 |
Related party LT |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance |  |  | 128 |
Credit loss expense |  |  | 9 |
Ending balance |  |  | 137 | $ 128
Credit loss expense |  |  | $ 9 |

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- Definition Amount of allowance for 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 (a) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121599878&loc=SL82895884-210446 + Details
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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=121599337&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=120395209&loc=SL114868664-224227 + Details
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