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Equity affiliates, other investments and related parties - Related parties (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Balance sheet      
Receivables: Debtors and other debtors $ 486 $ 496 $ 492
Receivables: Loans (excl. loans to equity affiliates) 42 57 63
Payables: Creditors and other creditors 968 888 1,161
Payables: Debts 2 2 2
Statement of income      
Sales 4,127 4,192 3,407
Purchases (10,158) (9,253) (7,354)
Financial income 4 2 6
Financial expense $ (4) $ (5) $ (9)