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Investment Securities (Details 1)
$ in Millions
Dec. 31, 2019
USD ($)
Available-for-sale investment securities with gross unrealized losses and length of time  
Estimated Fair Value, Less than 12 months $ 18
Estimated Fair Value, 12 months or more 324
Available-for-sale investment securities with gross unrealized losses  
Gross Unrealized Losses, Less than 12 Months (1)
Gross Unrealized Losses, 12 months or more (1)
State and municipal obligations [Member]  
Available-for-sale investment securities with gross unrealized losses and length of time  
Estimated Fair Value, Less than 12 months 18
Estimated Fair Value, 12 months or more 0
Available-for-sale investment securities with gross unrealized losses  
Gross Unrealized Losses, Less than 12 Months (1)
Gross Unrealized Losses, 12 months or more 0
U.S. Government treasury obligations [Member]  
Available-for-sale investment securities with gross unrealized losses and length of time  
Estimated Fair Value, Less than 12 months 0
Estimated Fair Value, 12 months or more 324
Available-for-sale investment securities with gross unrealized losses  
Gross Unrealized Losses, Less than 12 Months 0
Gross Unrealized Losses, 12 months or more $ (1)