v3.25.4
Business segment data - Narrative (Detail)
$ in Millions
12 Months Ended
Dec. 31, 2025
USD ($)
Segment
Activity
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Segment Reporting Information [Line Items]      
Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration] srt:ChiefExecutiveOfficerMember    
Number of Reportable Segments | Segment 7    
Number of insurance segment activities | Activity 2    
Sales $ 371,444 $ 371,433 $ 364,482
Sales, Service and Leasing Revenues [Member]      
Segment Reporting Information [Line Items]      
Sales $ 209,600 $ 211,600 $ 215,600
United States [Member] | Geographic Concentration [Member] | Sales, Service and Leasing Revenues [Member]      
Segment Reporting Information [Line Items]      
Concentration percentage 87.00% 86.00% 87.00%
United States [Member] | Geographic Concentration [Member] | Property, Plant and Equipment and Equipment Held for Lease [Member]      
Segment Reporting Information [Line Items]      
Concentration percentage 91.00%    
Railroad, Utilities and Energy [Member]      
Segment Reporting Information [Line Items]      
Sales $ 49,723 $ 49,790 $ 49,751
Railroad, Utilities and Energy [Member] | United States [Member] | Geographic Concentration [Member] | Revenues [Member]      
Segment Reporting Information [Line Items]      
Concentration percentage 96.00% 95.00% 96.00%