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Medium- And Long-Term Debt (Schedule Of Medium- And Long-Term Debt) (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Jul. 31, 2018
Mar. 31, 2018
Debt Instrument [Line Items]        
Total medium- and long-term debt $ 6,418 $ 4,622    
Parent Company        
Debt Instrument [Line Items]        
Medium-term notes 1,189 347    
Total medium- and long-term debt 1,432 602    
Subsidiaries        
Debt Instrument [Line Items]        
Subordinated notes 527 555    
Long-term Federal Home Loan Bank Advances 3,800 2,800    
Total medium- and long-term debt 4,986 4,020    
3.80% subordinated notes due 2026 | Parent Company        
Debt Instrument [Line Items]        
Subordinated notes [1] $ 243 $ 255    
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] $ 347 $ 347    
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 $ 842 [1] $ 0 $ 850  
Stated interest rate 3.70%   3.70%  
Maturity date Jul. 31, 2023      
4.00% subordinated notes due 2025 | Subsidiaries        
Debt Instrument [Line Items]        
Subordinated notes [1] $ 332 $ 347    
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] $ 195 $ 208    
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] $ 659 $ 665    
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 2.20%      
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 $ 0   $ 1,000
Maturity date Jan. 26, 2028      
Weighted-average interest rate 2.35%      
[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.