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Medium- And Long-Term Debt (Narrative) (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Aug. 01, 2019
Jul. 23, 2019
Feb. 01, 2019
Dec. 31, 2018
Debt Instrument [Line Items]          
Unamortized debt issuance cost $ 13       $ 8
Parent Company [Member]          
Debt Instrument [Line Items]          
Other Long-term Debt 1,495       1,209
Subsidiaries          
Debt Instrument [Line Items]          
Other Long-term Debt 1,175       663
Long-term Federal Home Loan Bank Advances 3,800       3,800
Real estate-related loans securing FHLB advances 17,200        
Potential FHLB borrowing capacity 5,100        
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 2.16%        
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
Weighted-average interest rate 2.34%        
4.00% subordinated notes due 2025 | Subsidiaries          
Debt Instrument [Line Items]          
Stated interest rate 4.00%       4.00%
4.00% Notes Due 2029 | Parent Company [Member]          
Debt Instrument [Line Items]          
Other Long-term Debt $ 603 [1] $ 200   $ 350 $ 0 [1]
Stated interest rate 4.00%     4.00%  
2.50% notes due 2024 | Subsidiaries          
Debt Instrument [Line Items]          
Other Long-term Debt [1] $ 503   $ 500   $ 0
Stated interest rate 2.50%   2.50%    
[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.