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Other receivables (Detail) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Insurance and Other [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Insurance premiums receivable $ 20,083 $ 18,548
Reinsurance recoverables 5,366 5,177
Trade receivables 16,970 15,638
Other 5,666 5,199
Allowances for credit losses (684) (675)
Other receivables 47,401 43,887
Railroad, Utilities and Energy [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Trade receivables 3,708 3,764
Other 699 862
Allowances for credit losses (116) (123)
Other receivables $ 4,291 $ 4,503