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Other receivables (Detail) - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Insurance and Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Insurance premiums receivable $ 19,212 $ 18,395
Reinsurance recoverables 7,191 7,106
Trade receivables 15,069 14,510
Other 4,871 4,154
Allowances for credit losses (669) (675)
Other receivables 45,674 43,490
Railroad, Utilities and Energy [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Trade receivables 5,855 4,182
Other 1,112 754
Allowances for credit losses (153) (141)
Receivables $ 6,814 $ 4,795