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Business segment data - Revenues (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Segment Reporting Information [Line Items]        
Total revenues $ 92,995 $ 93,210 $ 276,517 $ 271,106
BNSF [Member]        
Segment Reporting Information [Line Items]        
Total revenues 5,920 5,829 17,344 17,638
Berkshire Hathaway Energy ("BHE") [Member]        
Segment Reporting Information [Line Items]        
Total revenues 7,323 7,269 20,068 20,058
Pilot [Member]        
Segment Reporting Information [Line Items]        
Total revenues 10,623 13,145 36,101 37,374 [1]
Manufacturing Businesses [Member]        
Segment Reporting Information [Line Items]        
Total revenues 19,670 19,168 57,988 56,507
McLane [Member]        
Segment Reporting Information [Line Items]        
Total revenues 12,527 13,279 37,098 38,857
Service and Retailing [Member]        
Segment Reporting Information [Line Items]        
Total revenues 9,828 9,921 29,422 29,932
Operating Businesses [Member]        
Segment Reporting Information [Line Items]        
Total revenues 92,809 93,199 276,165 271,193
Operating Businesses [Member] | Insurance Group [Member]        
Segment Reporting Information [Line Items]        
Interest, dividend and other investment income 4,609 2,948 11,850 8,258
Total revenues 26,664 24,308 77,332 69,975
Operating Businesses [Member] | Insurance Group [Member] | GEICO [Member]        
Segment Reporting Information [Line Items]        
Premiums earned 10,699 9,844 31,402 29,184
Operating Businesses [Member] | Insurance Group [Member] | Berkshire Hathaway Primary Group [Member]        
Segment Reporting Information [Line Items]        
Premiums earned 4,685 4,449 13,882 12,643
Operating Businesses [Member] | Insurance Group [Member] | Berkshire Hathaway Reinsurance Group [Member]        
Segment Reporting Information [Line Items]        
Premiums earned 6,671 7,067 20,198 19,890
Operating Businesses [Member] | BNSF [Member]        
Segment Reporting Information [Line Items]        
Total revenues 5,940 5,847 17,405 17,694
Operating Businesses [Member] | Berkshire Hathaway Energy ("BHE") [Member]        
Segment Reporting Information [Line Items]        
Total revenues 7,335 7,281 20,104 20,094
Operating Businesses [Member] | Pilot [Member]        
Segment Reporting Information [Line Items]        
Total revenues 10,630 13,166 36,132 37,428
Operating Businesses [Member] | Manufacturing Businesses [Member]        
Segment Reporting Information [Line Items]        
Total revenues 19,675 19,174 58,044 56,565
Operating Businesses [Member] | McLane [Member]        
Segment Reporting Information [Line Items]        
Total revenues 12,723 13,477 37,656 39,419
Operating Businesses [Member] | Service and Retailing [Member]        
Segment Reporting Information [Line Items]        
Total revenues 9,842 9,946 29,492 30,018
Corporate, Eliminations and Other [Member]        
Segment Reporting Information [Line Items]        
Total revenues $ 186 $ 11 $ 352 $ (87)
[1] Revenues from Pilot are for the eight months ending September 30, 2023.