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Medium- And Long-Term Debt (Schedule Of Medium- And Long-Term Debt) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Feb. 01, 2019
Debt Instrument [Line Items]      
Total medium- and long-term debt $ 6,848 $ 6,463  
Parent Company      
Debt Instrument [Line Items]      
Medium-term notes 1,576 1,209  
Total medium- and long-term debt 1,832 1,459  
Subsidiaries      
Debt Instrument [Line Items]      
Subordinated notes 549 541  
Long-term Federal Home Loan Bank Advances 3,800 3,800  
Total medium- and long-term debt 5,016 5,004  
3.80% subordinated notes due 2026 | Parent Company      
Debt Instrument [Line Items]      
Subordinated notes [1] $ 256 $ 250  
Stated interest rate 3.80% 3.80%  
Maturity date Jul. 22, 2026 Jul. 22, 2026  
2.125% notes due 2019 | Parent Company      
Debt Instrument [Line Items]      
Medium-term notes [1] $ 349 $ 348  
Stated interest rate 2.125% 2.125%  
Maturity date May 23, 2019 May 23, 2019  
3.70% Notes Due 2023 | Parent Company      
Debt Instrument [Line Items]      
Medium-term notes [1] $ 869 $ 861  
Stated interest rate 3.70% 3.70%  
Maturity date Jul. 31, 2023 Jul. 31, 2023  
4.00% Notes Due 2029 | Parent Company      
Debt Instrument [Line Items]      
Medium-term notes $ 358 [1] $ 0 [1] $ 350
Stated interest rate 4.00%   4.00%
Maturity date Feb. 01, 2029    
4.00% subordinated notes due 2025 | Subsidiaries      
Debt Instrument [Line Items]      
Subordinated notes [1] $ 349 $ 343  
Stated interest rate 4.00% 4.00%  
Maturity date Jul. 27, 2025 Jul. 27, 2025  
7.875% subordinated notes due 2026 | Subsidiaries      
Debt Instrument [Line Items]      
Subordinated notes [1] $ 200 $ 198  
Stated interest rate 7.875% 7.875%  
Maturity date Sep. 15, 2026 Sep. 15, 2026  
2.50% notes due 2020 | Subsidiaries      
Debt Instrument [Line Items]      
Medium-term notes [1] $ 667 $ 663  
Stated interest rate 2.50% 2.50%  
Maturity date Jun. 02, 2020 Jun. 02, 2020  
Floating-rate based on FHLB auction rate due 2026 | Subsidiaries      
Debt Instrument [Line Items]      
Long-term Federal Home Loan Bank Advances $ 2,800 $ 2,800  
Weighted-average interest rate 2.55%    
Floating-rate based on FHLB auction rate due 2026 | Subsidiaries | Maximum      
Debt Instrument [Line Items]      
Maturity date May 20, 2026    
Floating-rate based on FHLB auction rate due 2026 | Subsidiaries | Minimum      
Debt Instrument [Line Items]      
Maturity date Mar. 04, 2026    
Floating-rate based on FHLB auction rate due 2028 | Subsidiaries      
Debt Instrument [Line Items]      
Long-term Federal Home Loan Bank Advances $ 1,000 $ 1,000  
Maturity date Jan. 26, 2028    
Weighted-average interest rate 2.73%    
[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.