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Postemployment benefit plans - Schedule of expected contributions, expected benefit payments and gross prescription drug subsidy receipts (Details)
$ in Millions
Dec. 31, 2024
USD ($)
Expected Medicare Part D subsidy:  
2025 $ 6
2026 6
2027 5
2028 5
2029 5
2030-2034 19
Total 46
Pension Plan | U.S. Pension Benefits  
Expected employer contributions:  
2025 49
Expected benefit payments:  
2025 1,000
2026 995
2027 985
2028 980
2029 970
2030-2034 4,640
Total 9,570
Pension Plan | Non-U.S.  Pension Benefits  
Expected employer contributions:  
2025 53
Expected benefit payments:  
2025 185
2026 180
2027 185
2028 195
2029 200
2030-2034 1,030
Total 1,975
Other Postretirement  Benefits  
Expected employer contributions:  
2025 252
Expected benefit payments:  
2025 235
2026 230
2027 230
2028 230
2029 225
2030-2034 1,080
Total $ 2,230