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Related party transactions - Related Party Payable Balances (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020
Related Party Transaction [Line Items]
Total related party liabilities	$ 635	$ 433
Amounts due to related parties - current	0	7
Long-term debt due to related parties	0	426
Liabilities subject to compromise	6,406		$ 0
Related party loans payable
Related Party Transaction [Line Items]
Total related party liabilities	635	426
Long-term debt due to related parties	0	426
Liabilities subject to compromise	635	0
Trading balances
Related Party Transaction [Line Items]
Amounts due to related parties - current	$ 0	$ 7

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- Definition

Carrying amount as of the balance sheet date of obligations due all related parties. For classified balance sheets, represents the current portion of such liabilities (due within one year or within the normal operating cycle if longer).

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