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General - Summary of Reclassifications to Amounts Previously Reported (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Costs and expenses:        
Interest expense $ 1,261 $ 1,214 $ 3,771 $ 3,760
Insurance and Other [Member]        
Revenues:        
Sales and service revenues 51,011 49,453 148,484 151,227
Interest, dividend and other investment income 5,697 5,928 17,331 15,550
Costs and expenses:        
Cost of sales and services 40,875 39,579 119,042 122,453
Selling, general and administrative expenses 6,285 8,219 21,897 19,793
Interest expense 325 315 983 1,057
Railroad, Utilities and Energy [Member]        
Revenues:        
Utility and energy operating revenues 6,046 6,014 16,658 16,350
Service revenues and other income 1,274 1,345 3,467 3,821
Costs and expenses:        
Utility and energy cost of sales and other expenses 4,578 4,456 12,825 12,849
Interest expense $ 936 899 $ 2,788 2,703
Previously Reported [Member] | Insurance and Other [Member]        
Revenues:        
Sales and service revenues   38,863   115,227
Interest, dividend and other investment income   5,896   15,450
Costs and expenses:        
Cost of sales and services   30,323   90,109
Selling, general and administrative expenses   7,324   17,292
Interest expense   315   961
Previously Reported [Member] | Railroad, Utilities and Energy [Member]        
Revenues:        
Utility and energy operating revenues   16,598   52,336
Service revenues and other income   1,383   3,935
Costs and expenses:        
Utility and energy cost of sales and other expenses   14,607   47,694
Interest expense   899   2,799
Reclassification [Member] | Insurance and Other [Member]        
Revenues:        
Sales and service revenues   10,590   36,000
Interest, dividend and other investment income   32   100
Costs and expenses:        
Cost of sales and services   9,256   32,344
Selling, general and administrative expenses   895   2,501
Interest expense       96
Reclassification [Member] | Railroad, Utilities and Energy [Member]        
Revenues:        
Utility and energy operating revenues   (10,584)   (35,986)
Service revenues and other income   (38)   (114)
Costs and expenses:        
Utility and energy cost of sales and other expenses   $ (10,151)   (34,845)
Interest expense       $ (96)