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Employee benefits - Expected benefit payments (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2021
USD ($)
Employee benefits  
Disbursement of cash flow in 2021 $ 89
2022. | Overfunded pension plans  
Employee benefits  
Expected benefit payments 230
2022. | Underfunded pension plans  
Employee benefits  
Expected benefit payments 229
2022. | Other benefits  
Employee benefits  
Expected benefit payments 69
2023. | Overfunded pension plans  
Employee benefits  
Expected benefit payments 232
2023. | Underfunded pension plans  
Employee benefits  
Expected benefit payments 228
2023. | Other benefits  
Employee benefits  
Expected benefit payments 70
2024 | Overfunded pension plans  
Employee benefits  
Expected benefit payments 235
2024 | Underfunded pension plans  
Employee benefits  
Expected benefit payments 227
2024 | Other benefits  
Employee benefits  
Expected benefit payments 72
2025 | Overfunded pension plans  
Employee benefits  
Expected benefit payments 237
2025 | Underfunded pension plans  
Employee benefits  
Expected benefit payments 226
2025 | Other benefits  
Employee benefits  
Expected benefit payments 70
2026 | Overfunded pension plans  
Employee benefits  
Expected benefit payments 237
2026 | Underfunded pension plans  
Employee benefits  
Expected benefit payments 223
2026 | Other benefits  
Employee benefits  
Expected benefit payments 72
2027 and thereafter | Overfunded pension plans  
Employee benefits  
Expected benefit payments 1,196
2027 and thereafter | Underfunded pension plans  
Employee benefits  
Expected benefit payments 1,085
2027 and thereafter | Other benefits  
Employee benefits  
Expected benefit payments $ 388