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Medium- And Long-Term Debt (Narrative) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Aug. 01, 2019
Jul. 23, 2019
Feb. 01, 2019
Dec. 31, 2018
Debt Instrument [Line Items]          
Unamortized debt issuance costs $ 12       $ 8
Parent Company          
Debt Instrument [Line Items]          
Medium- and long-term notes 1,471       1,209
Subsidiaries          
Debt Instrument [Line Items]          
Medium- and long-term notes 1,172       663
Long-term Federal Home Loan Bank advances 3,800       3,800
Blanket lien on real-estate related loans securing FHLB advances 17,200        
Potential FHLB borrowing capacity 5,100        
4.00% notes due 2029 | Parent Company          
Debt Instrument [Line Items]          
Medium- and long-term notes $ 587 [1] $ 200   $ 350 0 [1]
Stated interest rate 4.00%     4.00%  
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 1.70%        
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 1.88%        
3.70% notes due 2023 | Parent Company          
Debt Instrument [Line Items]          
Medium- and long-term notes [1] $ 884       861
Stated interest rate 3.70%        
2.50% notes due 2024 | Subsidiaries          
Debt Instrument [Line Items]          
Medium- and long-term notes $ 498 [1]   $ 500   $ 0 [1]
Stated interest rate     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.