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Postretirement benefits (Schedule of Expected Future Benefit Payments) (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Pension Plan [Member] | UNITED STATES  
Defined Benefit Plan Disclosure [Line Items]  
2019 $ 140
2020 148
2021 155
2022 162
2023 168
2024-2028 909
Pension Plan [Member] | Non-US [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2019 26
2020 28
2021 27
2022 26
2023 28
2024-2028 155
Other Postretirement Benefits Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2019 18
2020 19
2021 21
2022 22
2023 18
2024-2028 $ 19