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Business segment data - Revenues (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Segment Reporting Information [Line Items]        
Total revenues $ 93,653 $ 92,503 $ 183,522 $ 177,896
BNSF [Member]        
Segment Reporting Information [Line Items]        
Total revenues 5,787 5,808 11,424 11,809
Berkshire Hathaway Energy ("BHE") [Member]        
Segment Reporting Information [Line Items]        
Total revenues 6,480 6,350 12,745 12,789
Pilot [Member]        
Segment Reporting Information [Line Items]        
Total revenues 12,984 14,733 25,478 24,229 [1]
Manufacturing Businesses [Member]        
Segment Reporting Information [Line Items]        
Total revenues 19,807 19,074 38,318 37,339
McLane [Member]        
Segment Reporting Information [Line Items]        
Total revenues 12,271 12,697 24,571 25,578
Service and Retailing [Member]        
Segment Reporting Information [Line Items]        
Total revenues 9,922 10,109 19,594 20,011
Operating Businesses [Member]        
Segment Reporting Information [Line Items]        
Total revenues 93,571 92,549 183,356 177,994
Operating Businesses [Member] | Insurance Group [Member]        
Segment Reporting Information [Line Items]        
Interest, dividend and other investment income 4,077 2,918 7,241 5,310
Total revenues 26,030 23,479 50,668 45,667
Operating Businesses [Member] | Insurance Group [Member] | GEICO [Member]        
Segment Reporting Information [Line Items]        
Premiums earned 10,469 9,714 20,703 19,340
Operating Businesses [Member] | Insurance Group [Member] | Berkshire Hathaway Primary Group [Member]        
Segment Reporting Information [Line Items]        
Premiums earned 4,656 4,233 9,197 8,194
Operating Businesses [Member] | Insurance Group [Member] | Berkshire Hathaway Reinsurance Group [Member]        
Segment Reporting Information [Line Items]        
Premiums earned 6,828 6,614 13,527 12,823
Operating Businesses [Member] | BNSF [Member]        
Segment Reporting Information [Line Items]        
Total revenues 5,805 5,828 11,465 11,847
Operating Businesses [Member] | Berkshire Hathaway Energy ("BHE") [Member]        
Segment Reporting Information [Line Items]        
Total revenues 6,492 6,362 12,769 12,813
Operating Businesses [Member] | Pilot [Member]        
Segment Reporting Information [Line Items]        
Total revenues 12,999 14,754 25,502 24,262
Operating Businesses [Member] | Manufacturing Businesses [Member]        
Segment Reporting Information [Line Items]        
Total revenues 19,840 19,102 38,369 37,391
Operating Businesses [Member] | McLane [Member]        
Segment Reporting Information [Line Items]        
Total revenues 12,458 12,883 24,933 25,942
Operating Businesses [Member] | Service and Retailing [Member]        
Segment Reporting Information [Line Items]        
Total revenues 9,947 10,141 19,650 20,072
Corporate, Eliminations and Other [Member]        
Segment Reporting Information [Line Items]        
Total revenues $ 82 $ (46) $ 166 $ (98)
[1] Revenues from Pilot are for the five months ending June 30, 2023.