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DERIVATIVE FINANCIAL INSTRUMENTS - Cash Flow Hedges, Fair Value Hedges, Credit Risk (Details)
$ in Millions
9 Months Ended
Mar. 31, 2019
USD ($)
item
Jun. 30, 2018
USD ($)
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 $ 31  
Derivatives in Cash Flow Hedging Relationships    
Foreign Currency Cash-Flow Hedges    
Amount expected to be reclassified from AOCI into earnings, net of tax, within the next twelve months 17  
Accumulated net gain on derivative instruments in AOCI, before tax 55 $ 53
Derivatives in Cash Flow Hedging Relationships | Foreign currency forward contracts    
Foreign Currency Cash-Flow Hedges    
Notional amount 4,526  
Derivatives in Fair Value Hedging Relationships | Interest rate swap contracts | 2020 Senior Notes    
Fair Value Hedges    
Notional amount $ 250  
Derivatives in Fair Value Hedging Relationships | Interest rate swap contracts | 2020 Senior Notes | LIBOR    
Fair Value Hedges    
Number of months for LIBOR calculation 3 months  
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  
Derivatives in Fair Value Hedging Relationships | Interest rate swap contracts | 1.70% Senior Notes, due May 10, 2021 ("2021 Senior Notes") | LIBOR    
Fair Value Hedges    
Number of months for LIBOR calculation 3 months  
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  
Derivatives in Fair Value Hedging Relationships | Interest rate swap contracts | 2.35% Senior Notes due August 15, 2022 ("2022 Senior Notes") | LIBOR    
Fair Value Hedges    
Number of months for LIBOR calculation 3 months