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Other receivables (Detail) - USD ($)
$ in Millions
Sep. 30, 2022
Dec. 31, 2021
Insurance and Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Insurance premiums receivable $ 17,815 $ 15,050
Reinsurance recoverables 4,793 4,900
Trade receivables 14,448 12,971
Other 4,051 3,146
Allowances for credit losses (724) (679)
Other receivables 40,383 35,388
Railroad, Utilities and Energy [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Trade receivables 4,362 3,678
Other 765 650
Allowances for credit losses (142) (151)
Receivables $ 4,985 $ 4,177