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Other receivables (Detail) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Insurance and Other [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Insurance premiums receivable $ 19,052 $ 18,395  
Reinsurance recoverables 7,060 7,106  
Trade receivables 14,449 14,510  
Other 4,269 4,154  
Allowances for credit losses (656) (675)  
Other receivables 44,174 43,490 $ 44,174
Railroad, Utilities and Energy [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Trade receivables 6,034 4,182  
Other 1,228 754  
Allowances for credit losses (176) (141)  
Receivables $ 7,086 $ 4,795 $ 7,086