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Trade receivables - Trade receivables by currency (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure of geographical areas [line items] |  |
Total trade receivables, net | $ 1,390 | $ 1,253
US dollar (USD) |  |
Disclosure of geographical areas [line items] |  |
Total trade receivables, net | 463 | 449
Euro (EUR) |  |
Disclosure of geographical areas [line items] |  |
Total trade receivables, net | 243 | 215
Japanese yen (JPY) |  |
Disclosure of geographical areas [line items] |  |
Total trade receivables, net | 168 | 152
Chinese yuan (CNY) |  |
Disclosure of geographical areas [line items] |  |
Total trade receivables, net | 102 | 74
Indian rupee (INR) |  |
Disclosure of geographical areas [line items] |  |
Total trade receivables, net | 33 | 34
Canadian dollar (CAD) |  |
Disclosure of geographical areas [line items] |  |
Total trade receivables, net | 30 | 30
Australian dollar (AUD) |  |
Disclosure of geographical areas [line items] |  |
Total trade receivables, net | 29 | 27
British pound (GBP) |  |
Disclosure of geographical areas [line items] |  |
Total trade receivables, net | 24 | 25
Russian ruble (RUB) |  |
Disclosure of geographical areas [line items] |  |
Total trade receivables, net | 34 | 24
South Korean won (KRW) |  |
Disclosure of geographical areas [line items] |  |
Total trade receivables, net | 29 | 23
Other currencies |  |
Disclosure of geographical areas [line items] |  |
Total trade receivables, net | $ 235 | $ 200

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