v3.26.1
Borrowings - Schedule of Components of Long-Term Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Debt Instrument [Line Items]    
Total long-term debt $ 9,917 $ 12,105
Parent Company    
Debt Instrument [Line Items]    
Total long-term debt 5,106 5,294
Parent Company | Senior Notes Due 2027-2035 | Senior Notes    
Debt Instrument [Line Items]    
Senior notes $ 4,659 4,251
Parent Company | Senior Notes Due 2027-2035 | Senior Notes | Minimum    
Debt Instrument [Line Items]    
Stated rate 2.25%  
Parent Company | Senior Notes Due 2027-2035 | Senior Notes | Maximum    
Debt Instrument [Line Items]    
Stated rate 6.40%  
Parent Company | Junior Subordinated Debentures Due 2028-2037 | Subordinated notes    
Debt Instrument [Line Items]    
Junior subordinated debentures $ 447 444
Parent Company | Junior Subordinated Debentures Due 2028-2037 | Subordinated notes | Minimum    
Debt Instrument [Line Items]    
Stated rate 4.99%  
Parent Company | Junior Subordinated Debentures Due 2028-2037 | Subordinated notes | Maximum    
Debt Instrument [Line Items]    
Stated rate 7.75%  
Parent Company | Other Variable Rate Notes | Subordinated notes    
Debt Instrument [Line Items]    
Junior subordinated debentures $ 0 599
Subsidiaries    
Debt Instrument [Line Items]    
Total long-term debt 4,811 6,811
Subsidiaries | Line of Credit | Revolving Credit Facility    
Debt Instrument [Line Items]    
Revolving loans 0 211
Subsidiaries | Senior Notes Due 2027-2039 | Senior Notes    
Debt Instrument [Line Items]    
Senior notes $ 2,229 4,540
Subsidiaries | Senior Notes Due 2027-2039 | Senior Notes | Minimum    
Debt Instrument [Line Items]    
Stated rate 3.97%  
Subsidiaries | Senior Notes Due 2027-2039 | Senior Notes | Maximum    
Debt Instrument [Line Items]    
Stated rate 5.85%  
Subsidiaries | Subordinated Notes Due 2026- 2032 | Subordinated notes    
Debt Instrument [Line Items]    
Junior subordinated debentures $ 1,932 1,869
Subsidiaries | Subordinated Notes Due 2026- 2032 | Subordinated notes | Minimum    
Debt Instrument [Line Items]    
Stated rate 3.40%  
Subsidiaries | Subordinated Notes Due 2026- 2032 | Subordinated notes | Maximum    
Debt Instrument [Line Items]    
Stated rate 6.95%  
Subsidiaries | Federal Home Loan Bank advances    
Debt Instrument [Line Items]    
Federal Home Loan Bank advances $ 560 79
Subsidiaries | Federal Home Loan Bank advances | Minimum    
Debt Instrument [Line Items]    
Stated rate 1.39%  
Subsidiaries | Federal Home Loan Bank advances | Maximum    
Debt Instrument [Line Items]    
Stated rate 7.36%  
Subsidiaries | Secured borrowing    
Debt Instrument [Line Items]    
Other long-term debt $ 90 $ 112