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DERIVATIVE FINANCIAL INSTRUMENTS - Cash Flow Hedges, Fair Value Hedges, Credit Risk (Details)
Mar. 31, 2020
USD ($)
item
Jun. 30, 2019
USD ($)
Derivatives Not Designated as Hedging Instruments    
Derivative instruments    
Notional amount $ 3,399,000,000  
Foreign Currency Cash-Flow Hedges    
Notional amount $ 3,399,000,000  
Derivative    
Credit Risk    
Minimum number of nationally recognized rating agencies | item 2  
Maximum exposure to credit risk in the event of non performance by counterparties, gross fair value of contracts in asset positions $ 86,000,000  
Cash flow hedges    
Foreign Currency Cash-Flow Hedges    
Amount expected to be reclassified from AOCI into earnings, net of tax, within the next twelve months 22,000,000  
Accumulated net gain on derivative instruments in AOCI, before tax 39,000,000 $ 29,000,000
Cash flow hedges | Foreign currency forward contracts    
Derivative instruments    
Notional amount 1,584,000,000  
Foreign Currency Cash-Flow Hedges    
Notional amount 1,584,000,000  
Derivatives in fair value hedging relationships | Interest rate swap contracts | 1.70% Senior Notes, due May 10, 2021 ("2021 Senior Notes")    
Fair Value Hedges    
Notional amount 450,000,000  
Derivatives in fair value hedging relationships | Interest rate swap contracts | 2.35% Senior Notes due August 15, 2022 ("2022 Senior Notes")    
Fair Value Hedges    
Notional amount 250,000,000  
Net investment hedges | Foreign currency forward contracts    
Fair Value Hedges    
Notional amount $ 1,759,000,000