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Significant business acquisitions - Summary of preliminary values of identified assets acquired and liabilities assumed (Detail) - USD ($)
$ in Millions
Sep. 30, 2023
[1]
Jan. 31, 2023
Dec. 31, 2022
[1]
Oct. 19, 2022
Dec. 31, 2021
Assets acquired          
Goodwill $ 85,652   $ 78,119   $ 73,875
Pilot Travel Centers LLC [Member]          
Assets acquired          
Property, plant and equipment   $ 8,189      
Goodwill and other intangible assets   13,202      
Other assets   6,994      
Assets acquired   28,385      
Net assets   14,365      
Liabilities assumed and noncontrolling interests          
Notes payable   5,876      
Other liabilities   4,774      
Liabilities assumed   10,650      
Noncontrolling interests, predominantly redeemable   3,370      
Liabilities assumed and noncontrolling interests   $ 14,020      
Alleghany Corporation [Member]          
Assets acquired          
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  
Other intangible assets       2,659  
Goodwill       3,900  
Other assets       3,637  
Assets acquired       35,590  
Net assets       11,505  
Liabilities assumed and noncontrolling interests          
Unpaid losses and loss adjustment expenses       15,080  
Unearned premiums       3,536  
Notes payable       2,169  
Other liabilities       3,300  
Liabilities assumed       $ 24,085  
[1] Net of accumulated goodwill impairments of $11.0 billion as of September 30, 2023 and December 31, 2022.