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Postretirement benefits (Schedule of Expected Future Benefit Payments) (Details)
$ in Millions
Dec. 31, 2017
USD ($)
Pension Plan [Member] | UNITED STATES  
Defined Benefit Plan Disclosure [Line Items]  
2018 $ 129
2019 141
2020 148
2021 155
2022 163
2023-2027 881
Pension Plan [Member] | Non-US [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2018 23
2019 25
2020 29
2021 28
2022 27
2023-2027 159
Other Postretirement Benefits Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2018 17
2019 19
2020 20
2021 23
2022 25
2023-2027 $ 44