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Segment information - Reconciliations of consolidated profit before taxes (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Sales and revenues by geographic region    
Consolidated profit before tax $ 2,570 $ 3,532
Cost centers 4 14
Corporate costs (213) (201)
Timing (7) (67)
Restructuring costs (33) 6
Methodology differences:    
Inventory/cost of sales (27) (6)
Postretirement benefit income (expense) 14 (56)
Stock-based compensation expense (45) (44)
Financing costs (46) (28)
Currency (54) 87
Other income/expense methodology differences (142) (250)
Other methodology differences (12) (35)
Total sales and revenues from reportable segments    
Sales and revenues by geographic region    
Consolidated profit before tax 3,152 4,088
All Other Segment    
Sales and revenues by geographic region    
Consolidated profit before tax $ (21) $ 24