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Medium- And Long-Term Debt (Schedule Of Medium- And Long-Term Debt) (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Debt Instrument [Line Items]      
Total Federal Home Loan Bank advances:   $ 4,000  
Medium- and long-term debt $ 6,961   $ 3,024
Parent company      
Debt Instrument [Line Items]      
Medium- and long-term notes 1,363   1,356
Medium- and long-term debt 1,599   1,593
Subsidiaries      
Debt Instrument [Line Items]      
Subordinated notes 950   955
Medium- and long-term notes 480   476
Total Federal Home Loan Bank advances: 3,932   0
Medium- and long-term debt 5,362   1,431
3.80% subordinated notes due 2026 | Parent company      
Debt Instrument [Line Items]      
Subordinated notes $ 236   237
Stated interest rate 3.80%    
Maturity year 2026    
3.70% notes due 2023 | Parent company      
Debt Instrument [Line Items]      
Medium- and long-term notes $ 850   841
Stated interest rate 3.70%    
Maturity year 2023    
4.00% notes due 2029 | Parent company      
Debt Instrument [Line Items]      
Medium- and long-term notes $ 513   515
Stated interest rate 4.00%    
Maturity year 2029    
4.00% subordinated notes due 2025 | Subsidiaries      
Debt Instrument [Line Items]      
Subordinated notes $ 330   331
Stated interest rate 4.00%    
Maturity year 2025    
7.875% subordinated notes due 2026 | Subsidiaries      
Debt Instrument [Line Items]      
Subordinated notes $ 161   165
Stated interest rate 7.875%    
Maturity year 2026    
5.332 subordinated notes due 2033 | Subsidiaries      
Debt Instrument [Line Items]      
Subordinated notes $ 459   459
Stated interest rate 5.332%    
Maturity year 2033    
2.50% notes due 2024 | Subsidiaries      
Debt Instrument [Line Items]      
Medium- and long-term notes $ 480   476
Stated interest rate 2.50%    
Maturity year 2024    
5.07% advance due 2025 | Subsidiaries      
Debt Instrument [Line Items]      
Total Federal Home Loan Bank advances: $ 987   0
Stated interest rate 5.07%    
Maturity year 2025    
4.79% advance due 2026 | Subsidiaries      
Debt Instrument [Line Items]      
Total Federal Home Loan Bank advances: $ 983   0
Stated interest rate 4.79%    
Maturity year 2026    
4.49% advance due 2027 | Subsidiaries      
Debt Instrument [Line Items]      
Total Federal Home Loan Bank advances: $ 982   0
Stated interest rate 4.49%    
Maturity year 2027    
4.49% advance due 2028 | Subsidiaries      
Debt Instrument [Line Items]      
Total Federal Home Loan Bank advances: $ 980   $ 0
Stated interest rate 4.49%    
Maturity year 2028