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Goodwill and other intangible assets - Intangible assets (Detail) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Insurance and Other [Member]    
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]    
Gross carrying amount $ 51,511 $ 50,874
Accumulated amortization 17,456 16,236
Net carrying value 34,055 34,638
Railroad, Utilities and Energy [Member]    
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]    
Gross carrying amount 1,981 1,990
Accumulated amortization 918 854
Net carrying value 1,063 1,136
Customer relationships [Member] | Insurance and Other [Member]    
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]    
Gross carrying amount 31,150 30,941
Accumulated amortization 9,428 8,840
Net carrying value 21,722 22,101
Trademarks and trade names [Member] | Insurance and Other [Member]    
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]    
Gross carrying amount 9,047 9,007
Accumulated amortization 1,146 1,041
Net carrying value 7,901 7,966
Customer relationships and contracts [Member] | Railroad, Utilities and Energy [Member]    
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]    
Gross carrying amount 1,540 1,553
Accumulated amortization 785 728
Net carrying value 755 825
Other intangible assets [Member] | Insurance and Other [Member]    
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]    
Gross carrying amount 5,614 5,551
Accumulated amortization 2,216 1,996
Net carrying value 3,398 3,555
Other intangible assets [Member] | Railroad, Utilities and Energy [Member]    
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]    
Gross carrying amount 441 437
Accumulated amortization 133 126
Net carrying value 308 311
Patents and technology [Member] | Insurance and Other [Member]    
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]    
Gross carrying amount 5,700 5,375
Accumulated amortization 4,666 4,359
Net carrying value $ 1,034 $ 1,016