Quarterly report pursuant to Section 13 or 15(d)

BASIS OF PRESENTATION (Details)

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BASIS OF PRESENTATION (Details) - USD ($)
 3 Months Ended 9 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Sep. 30, 2020
Jul. 01, 2020
Jun. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Financing Receivable, Allowance for Credit Loss [Line Items]                      
Credit losses on available-for-sale debt securities recognized during the period $ 0 $ 0 $ 0 $ 0              
Net decrease of retained earnings (3,112,864,000) (2,325,196,000) (3,112,864,000) (2,325,196,000) $ (2,950,306,000) $ (2,762,345,000)   $ (2,681,010,000) $ (2,687,970,000) $ (2,679,619,000) $ (2,677,693,000)
Cumulative Effect, Period of Adoption, Adjustment                      
Financing Receivable, Allowance for Credit Loss [Line Items]                      
Net decrease of retained earnings               5,530,000      
Retained Earnings                      
Financing Receivable, Allowance for Credit Loss [Line Items]                      
Net decrease of retained earnings $ (1,070,124,000) $ (376,656,000) $ (1,070,124,000) $ (376,656,000) $ (903,696,000) $ (753,915,000)   (654,930,000) $ (719,001,000) $ (733,173,000) $ (714,825,000)
Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment                      
Financing Receivable, Allowance for Credit Loss [Line Items]                      
Net decrease of retained earnings             $ 5,500,000 $ 5,530,000