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Postretirement benefits (Schedule of Expected Future Benefit Payments) (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Other Postretirement Benefits Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2020 $ 19
2021 21
2022 22
2023 18
2024 13
2025-2029 11
Non - U.S. | Pension Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2020 27
2021 28
2022 27
2023 29
2024 29
2025-2029 171
UNITED STATES | Pension Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2020 151
2021 157
2022 164
2023 169
2024 174
2025-2029 $ 931