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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