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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Inventory and Promotional Merchandise (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Jun. 30, 2020
Accounting Policies [Abstract]    
Raw materials $ 550 $ 542
Work in process 258 305
Finished goods 1,072 995
Promotional merchandise 236 220
Inventory and promotional merchandise $ 2,116 $ 2,062