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NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Share Repurchase Program (Details) - USD ($)
Jun. 30, 2021
Aug. 04, 2020
Aug. 09, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]      
Stock repurchase program, additional authorized repurchase amount   $ 500,000,000 $ 1,000,000,000
Stock repurchase program, remaining authorized repurchase amount $ 880,000,000