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v3.21.2

Current expected credit losses - Movement in the Allowance for Credit Losses (Details) - USD ($) $ in Millions | 1 Months Ended | 6 Months Ended
--- | --- | ---
Apr. 30, 2021 | Jun. 30, 2021 | Jun. 30, 2020
Accounts Receivable, Noncurrent, Past Due [Line Items] |  |  |
Beginning balance |  | $ 309 | $ 143
Credit loss expense |  | 60 | 63
Write-off |  | (74) |
Ending balance |  | 295 | 206
Trade Receivable |  |  |
Accounts Receivable, Noncurrent, Past Due [Line Items] |  |  |
Beginning balance |  | 0 | 0
Credit loss expense |  | 0 | 0
Write-off |  | 0 |
Ending balance |  | 0 | 0
Allowance for credit losses - other current assets |  |  |
Accounts Receivable, Noncurrent, Past Due [Line Items] |  |  |
Beginning balance |  | 3 | 0
Credit loss expense |  | 0 | 5
Write-off |  | 0 |
Ending balance |  | 3 | 5
Allowance for credit losses - related party ST |  |  |
Accounts Receivable, Noncurrent, Past Due [Line Items] |  |  |
Beginning balance |  | 169 | 15
Credit loss expense |  | 48 | 54
Write-off |  | (74) |
Ending balance |  | 143 | 69
Allowance for credit losses - related party ST | Trade Receivable |  |  |
Accounts Receivable, Noncurrent, Past Due [Line Items] |  |  |
Write-off | $ (54) |  |
Allowance for credit losses - related party ST | Loans Receivable |  |  |
Accounts Receivable, Noncurrent, Past Due [Line Items] |  |  |
Write-off | $ (20) |  |
Allowance for credit losses related party LT |  |  |
Accounts Receivable, Noncurrent, Past Due [Line Items] |  |  |
Beginning balance |  | 137 | 128
Credit loss expense |  | 12 | 4
Write-off |  | 0 |
Ending balance |  | $ 149 | $ 132

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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=124255953&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=123577603&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=124255953&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=124255206&loc=SL82895884-210446 + Details
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