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Medium- And Long-Term Debt (Narrative) (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Feb. 01, 2019
Dec. 31, 2018
Debt Instrument [Line Items]      
Unamortized debt issuance cost $ 10   $ 8
Parent Company [Member]      
Debt Instrument [Line Items]      
Other Long-term Debt 1,576   1,209
Subsidiaries      
Debt Instrument [Line Items]      
Long-term Federal Home Loan Bank Advances 3,800   3,800
Real estate-related loans securing FHLB advances 16,300    
Potential FHLB borrowing capacity 4,600    
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 2028 | Subsidiaries      
Debt Instrument [Line Items]      
Long-term Federal Home Loan Bank Advances $ 1,000   1,000
Weighted-average interest rate 2.73%    
4.00% Notes Due 2029 | Parent Company [Member]      
Debt Instrument [Line Items]      
Other Long-term Debt $ 358 [1] $ 350 $ 0 [1]
Stated interest rate 4.00% 4.00%  
[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.