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Securities, Federal Home Loan Bank Stock (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Federal Home Loan Bank Stock [Member]        
Federal Home Loan Bank Stock [Abstract]        
Other-than-temporary impairment losses $ 0 $ 0 $ 0 $ 0