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Cash and Cash Equivalents (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Cash and Cash Equivalents [Abstract]    
Cash due from Federal Reserve Bank $ 5,500,000,000 $ 2,500,000,000
Cash due from depository institutions 93,000,000 62,000,000
Outstanding cash equivalents 0 0
Interest income from term deposit facility 300,000 200,000
Funds on deposit under the Term Deposit Facility program $ 0 $ 0