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Trade receivables - Trade receivables by currency (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure of geographical areas [line items] |  |
Total trade receivables, net | $ 1,361 | $ 1,390
US dollar (USD) |  |
Disclosure of geographical areas [line items] |  |
Total trade receivables, net | 477 | 463
Euro (EUR) |  |
Disclosure of geographical areas [line items] |  |
Total trade receivables, net | 214 | 243
Japanese yen (JPY) |  |
Disclosure of geographical areas [line items] |  |
Total trade receivables, net | 168 | 168
Chinese yuan (CNY) |  |
Disclosure of geographical areas [line items] |  |
Total trade receivables, net | 121 | 102
Indian rupee (INR) |  |
Disclosure of geographical areas [line items] |  |
Total trade receivables, net | 30 | 33
Canadian dollar (CAD) |  |
Disclosure of geographical areas [line items] |  |
Total trade receivables, net | 32 | 30
Australian dollar (AUD) |  |
Disclosure of geographical areas [line items] |  |
Total trade receivables, net | 29 | 29
British pound (GBP) |  |
Disclosure of geographical areas [line items] |  |
Total trade receivables, net | 21 | 24
Russian ruble (RUB) |  |
Disclosure of geographical areas [line items] |  |
Total trade receivables, net | 28 | 34
South Korean won (KRW) |  |
Disclosure of geographical areas [line items] |  |
Total trade receivables, net | 31 | 29
Other currencies |  |
Disclosure of geographical areas [line items] |  |
Total trade receivables, net | $ 210 | $ 235

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