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Financial Instruments (Schedule of Fair Value Gain Loss Derivative Instrument) (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Jun. 30, 2019
Fair Value Hedging | Interest Rate Swaps    
Derivative [Line Items]    
Notional Amount $ 550 $ 2,150
Fair Value Gain/(Loss) 27 40
Cash Flow Hedging | Foreign Currency Contracts    
Derivative [Line Items]    
Notional Amount 653 869
Fair Value Gain/(Loss) (4) 4
Cash Flow Hedging | Forward Contracts [Member]    
Derivative [Line Items]    
Notional Amount 200 0
Fair Value Gain/(Loss) (16) 0
Cash Flow Hedging | Currency Swap [Member]    
Derivative [Line Items]    
Notional Amount 833 233
Fair Value Gain/(Loss) 47 12
Cash Flow Hedging | Commodity Contracts    
Derivative [Line Items]    
Notional Amount 16 20
Fair Value Gain/(Loss) $ (1) $ (3)