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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, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Total Medium- and long-term debt $ 2,854 $ 5,728
Parent Company    
Debt Instrument [Line Items]    
Medium- and long-term notes 1,499 1,538
Total Medium- and long-term debt 1,770 1,818
Subsidiaries    
Debt Instrument [Line Items]    
Subordinated notes 569 587
Medium- and long-term notes 515 523
Long-term Federal Home Loan Bank Advances 0 2,800
Total Medium- and long-term debt 1,084 3,910
3.80% subordinated notes due 2026 | Parent Company    
Debt Instrument [Line Items]    
Subordinated notes [1] $ 271 280
Stated interest rate 3.80%  
Maturity year 2026  
3.70% Notes Due 2023 | Parent Company    
Debt Instrument [Line Items]    
Medium- and long-term notes [1] $ 892 905
Stated interest rate 3.70%  
Maturity year 2023  
4.00% Notes Due 2029 | Parent Company    
Debt Instrument [Line Items]    
Medium- and long-term notes [1] $ 607 633
Stated interest rate 4.00%  
Maturity year 2029  
4.00% subordinated notes due 2025 | Subsidiaries    
Debt Instrument [Line Items]    
Subordinated notes [1] $ 371 380
Stated interest rate 4.00%  
Maturity year 2025  
7.875% subordinated notes due 2026 | Subsidiaries    
Debt Instrument [Line Items]    
Subordinated notes [1] $ 198 207
Stated interest rate 7.875%  
Maturity year 2026  
2.50% notes due 2024 | Subsidiaries    
Debt Instrument [Line Items]    
Medium- and long-term notes [1] $ 515 523
Stated interest rate 2.50%  
Maturity year 2024  
Floating-rate based on FHLB auction rate due 2026 | Subsidiaries    
Debt Instrument [Line Items]    
Maturity year 2026  
Floating-rate based on FHLB auction rate due 2026 | Subsidiaries    
Debt Instrument [Line Items]    
Long-term Federal Home Loan Bank Advances $ 0 $ 2,800
[1] The fixed interest rates on these notes have been swapped to a variable rate and designated in a hedging relationship. Accordingly, carrying value has been adjusted to reflect the change in the fair value of the debt as a result of changes in the benchmark rate.