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Borrowings - Additional Information (Detail) - USD ($)
$ in Thousands
1 Months Ended 6 Months Ended
Jan. 31, 2023
Jun. 30, 2023
Dec. 31, 2022
Debt Instrument [Line Items]      
Junior subordinated debentures   $ 538,000  
Debt Maturity, Start Year   Jan. 01, 2027  
Debt Maturity, End Year   Dec. 31, 2033  
Description of variable rate basis Secured Overnight Financing Rate ("SOFR")    
Short-term borrowings   $ 7,907,884 $ 3,554,951
Additional borrowing capacity   14,900,000  
Available line of credit   16,100,000  
Long-term borrowings   $ 7,416,638 $ 3,964,537
5.053% Fixed Rate Senior Notes Due to Mature in January 2034 [Member]      
Debt Instrument [Line Items]      
Senior notes $ 1,000,000    
Senior notes maturity date Jan. 31, 2034    
Interest rate of debt instrument 5.053%    
Variable interest rate of debt instrument 1.85%    
4.65% Fixed Rate Senior Notes Due to Mature in January 2026 [Member]      
Debt Instrument [Line Items]      
Senior notes $ 1,300,000    
Senior notes maturity date Jan. 31, 2026    
Interest rate of debt instrument 4.65%    
4.70% Fixed Rate Senior Notes Due to Mature in January 2028 [Member]      
Debt Instrument [Line Items]      
Senior notes $ 1,200,000    
Senior notes maturity date Jan. 31, 2028    
Interest rate of debt instrument 4.70%