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Deposits (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Demand Deposits [Line Items]    
Noninterest-bearing Deposits $ 110 $ 22
Deposits 537 262
Adjustable rate    
Demand Deposits [Line Items]    
Interest-bearing Deposits - Adjustable rate $ 427 $ 240
Weighted Average Rate 1.30% 2.10%