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Business segment data - Additional tabular disclosures (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Segment Reporting Information [Line Items]            
Interest expense $ 1,261 $ 1,214 $ 3,771 $ 3,760    
Income tax expense (benefit) 7,241 6,028 10,010 16,541    
Depreciation and amortization 3,333 3,206 9,927 9,572    
Goodwill [1] 84,525   84,525   $ 83,880 $ 84,626
Assets 1,225,963   1,225,963   1,153,881  
Business Segments [Member]            
Segment Reporting Information [Line Items]            
Interest expense 1,327 1,272 3,952 3,712    
Income tax expense (benefit) 2,258 1,967 6,373 6,497    
Capital expenditures 5,586 4,701 14,725 13,629    
Depreciation and amortization 3,166 3,051 9,454 9,103    
Goodwill 84,525   84,525   83,880  
Identifiable assets 998,206   998,206   932,848  
Business Segments [Member] | Insurance Group [Member]            
Segment Reporting Information [Line Items]            
Income tax expense (benefit) 1,329 1,212 3,560 3,826    
Capital expenditures 30 10 65 59    
Depreciation and amortization 112 94 329 292    
Goodwill 16,557   16,557   16,557  
Identifiable assets 593,230   593,230   539,884  
Business Segments [Member] | BNSF [Member]            
Segment Reporting Information [Line Items]            
Interest expense 279 275 821 807    
Income tax expense (benefit) 463 463 1,195 1,234    
Capital expenditures 998 1,024 2,597 2,779    
Depreciation and amortization 684 644 2,034 1,964    
Goodwill 15,351   15,351   15,351  
Identifiable assets 81,537   81,537   80,813  
Business Segments [Member] | Berkshire Hathaway Energy ("BHE") [Member]            
Segment Reporting Information [Line Items]            
Interest expense 658 630 1,968 1,900    
Income tax expense (benefit) (606) (708) (1,385) (1,535)    
Capital expenditures 2,954 2,108 7,527 6,236    
Depreciation and amortization 1,035 997 3,118 2,979    
Goodwill 11,756   11,756   11,669  
Identifiable assets 134,614   134,614   128,276  
Business Segments [Member] | Manufacturing Businesses [Member]            
Segment Reporting Information [Line Items]            
Interest expense 303 264 886 657    
Income tax expense (benefit) 768 726 2,080 2,137    
Capital expenditures 646 669 1,956 2,028    
Depreciation and amortization 606 614 1,828 1,828    
Goodwill 28,273   28,273   27,716  
Identifiable assets 122,969   122,969   119,860  
Business Segments [Member] | Pilot [Member]            
Segment Reporting Information [Line Items]            
Interest expense 53 69 174 246    
Income tax expense (benefit) (3) 18 60 45    
Capital expenditures 233 174 691 570    
Depreciation and amortization 266 254 783 750    
Goodwill 6,477   6,477   6,477  
Identifiable assets 19,192   19,192   19,652  
Business Segments [Member] | McLane [Member]            
Segment Reporting Information [Line Items]            
Interest expense 6 4 19 14    
Income tax expense (benefit) 42 38 130 114    
Capital expenditures 48 60 115 139    
Depreciation and amortization 50 50 146 149    
Goodwill 232   232   232  
Identifiable assets 7,344   7,344   7,165  
Business Segments [Member] | Service and Retailing [Member]            
Segment Reporting Information [Line Items]            
Interest expense 28 30 84 88    
Income tax expense (benefit) 265 218 733 676    
Capital expenditures 677 656 1,774 1,818    
Depreciation and amortization 413 398 1,216 1,141    
Goodwill 5,879   5,879   5,878  
Identifiable assets 39,320   39,320   37,198  
Segment Reconciling Items [Member]            
Segment Reporting Information [Line Items]            
Investment gains (losses), tax 4,622 4,325 4,611 9,801    
Equity method investments, tax 54 23 (1,105) 143    
Goodwill 84,525   84,525   83,880  
Corporate, Eliminations and Other [Member]            
Segment Reporting Information [Line Items]            
Interest expense (66) (58) (181) 48    
Income tax expense (benefit) 307 (287) 131 100    
Depreciation and amortization 167 $ 155 473 $ 469    
Identifiable assets $ 143,232   $ 143,232   $ 137,153  
[1] Net of accumulated goodwill impairments of $11.5 billion as of September 30, 2025 and December 31, 2024 and $11.1 billion as of December 31, 2023.