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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

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