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Postretirement benefits (Schedule of Expected Future Benefit Payments) (Details)
$ in Millions
Dec. 31, 2020
USD ($)
Other Postretirement Benefits Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2021 $ 19
2022 20
2023 16
2024 12
2025 7
2026-2030 5
Non - U.S. | Pension Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2021 30
2022 28
2023 30
2024 32
2025 32
2026-2030 185
UNITED STATES | Pension Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2021 159
2022 166
2023 171
2024 175
2025 180
2026-2030 $ 947