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Financial Instruments (Schedule of Outstanding Instruments, Fair Value Hedges) (Details) - Fair Value Hedging - Interest Rate Swaps - USD ($)
$ in Millions
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Derivative [Line Items]      
Notional Amount $ 550 $ 2,150  
Designated as Hedging Instrument      
Derivative [Line Items]      
Deferred Gain (Loss) on Discontinuation of Interest Rate Fair Value Hedge 112    
Derivatives, matured notional amounts $ 200   $ 550
Notional Amount     $ 1,100