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Medium- And Long-Term Debt (Narrative) (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Jul. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]        
Unamortized debt issuance cost $ 9     $ 5
Parent Company [Member]        
Debt Instrument [Line Items]        
Other Long-term Debt 1,189     347
Subsidiaries        
Debt Instrument [Line Items]        
Long-term Federal Home Loan Bank Advances 3,800     2,800
Blanket lien on real estate-related loans securing FHLB advances 15,900      
Potential FHLB borrowing capacity 5,200      
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 2028 | Subsidiaries        
Debt Instrument [Line Items]        
Long-term Federal Home Loan Bank Advances $ 1,000   $ 1,000 0
Weighted-average interest rate 2.35%      
3.70% notes due 2023 | Parent Company [Member]        
Debt Instrument [Line Items]        
Other Long-term Debt $ 842 [1] $ 850   $ 0
Stated interest rate 3.70% 3.70%    
[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.