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Other receivables (Detail) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Insurance and Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Insurance premiums receivable $ 17,391 $ 15,050
Reinsurance recoverables 4,836 4,900
Trade receivables 14,511 12,971
Other 3,648 3,146
Allowances for credit losses (708) (679)
Other receivables 39,678 35,388
Railroad, Utilities and Energy [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Trade receivables 4,167 3,678
Other 789 650
Allowances for credit losses (141) (151)
Receivables $ 4,815 $ 4,177