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Other receivables (Detail) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Insurance and Other [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Insurance premiums receivable $ 19,646 $ 18,395
Reinsurance recoverables 7,185 7,106
Trade receivables 15,454 14,510
Other 4,259 4,154
Allowances for credit losses (666) (675)
Other receivables 45,878 43,490
Railroad, Utilities and Energy [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Trade receivables 5,795 4,182
Other 1,219 754
Allowances for credit losses (166) (141)
Receivables $ 6,848 $ 4,795