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Other receivables (Detail) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Insurance and Other [Member]
Accounts Notes And Loans Receivable [Line Items]
Insurance premiums receivable	$ 19,841	$ 19,052
Reinsurance recoverables	5,253	7,060
Trade receivables	15,568	14,449
Other	5,979	4,269
Allowances for credit losses	(674)	(656)
Other receivables	45,967	44,174
Railroad, Utilities and Energy [Member]
Accounts Notes And Loans Receivable [Line Items]
Trade receivables	5,809	6,034
Other	853	1,228
Allowances for credit losses	(160)	(176)
Other receivables	$ 6,502	$ 7,086

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Amount, after allowance, receivable from customers, clients, or other third-parties, and receivables classified as other.

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Amount, before allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business.

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The valuation allowance as of the balance sheet date to reduce the gross amount of receivables to estimated net realizable value, which would be presented in parentheses on the face of the balance sheet.

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Amount due from parties in nontrade transactions, classified as other.

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Carrying amount as of the balance sheet date, net of allowance for doubtful accounts, of all premiums and other types of receivables due from other persons or entities.

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Gross amount, as of the balance sheet date, due the entity from (a) agents and insureds, (b) uncollected premiums and (c) others, before deducting the allowance for doubtful accounts.

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Amount before valuation allowance recoverable under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, premium paid, policy benefits and policy reserves.

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