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Equity affiliates, other investments and related parties - Related parties (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Balance sheet      
Receivables: Debtors and other debtors $ 545 $ 486 $ 496
Receivables: Loans (excl. loans to equity affiliates) 89 42 57
Payables: Creditors and other creditors 662 968 888
Payables: Debts 3 2 2
Statement of income      
Sales 3,134 4,127 4,192
Purchases (7,183) (10,158) (9,253)
Financial income 1 4 2
Financial expense $ (6) $ (4) $ (5)