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Other receivables (Detail) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Insurance and Other [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Insurance premiums receivable $ 19,695 $ 19,052
Reinsurance recoverables 5,421 7,060
Trade receivables 15,263 14,449
Other 7,048 4,269
Allowances for credit losses (655) (656)
Other receivables 46,772 44,174
Railroad, Utilities and Energy [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Trade receivables 5,378 6,034
Other 851 1,228
Allowances for credit losses (166) (176)
Other receivables $ 6,063 $ 7,086