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Significant business acquisitions - Summary of preliminary values of identified assets acquired and liabilities assumed (Detail) - Alleghany Corporation [Member]
$ in Millions
Oct. 19, 2022
USD ($)
Business Acquisition [Line Items]  
Cash, cash equivalents and U.S. Treasury Bills $ 3,762
Investments in fixed maturity and equity securities 15,982
Loans and other receivables 5,650
Goodwill and other intangible assets 6,362
Other 3,834
Assets acquired 35,590
Unpaid losses and loss adjustment expenses 15,080
Unearned premiums 3,536
Notes payable 2,169
Other 3,300
Liabilities assumed 24,085
Net assets $ 11,505