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Financial Instruments (Schedule of Outstanding Instruments, Cash Flow Hedges) (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2018
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Cash Flow Hedging |  |  |
Derivative [Line Items] |  |  |
Derivative Liability, Notional Amount | $ 200 |  |
Fair Value Hedging | Interest Rate Swaps |  |  |
Derivative [Line Items] |  |  |
Notional Amount | 550 | $ 2,150 |
Cash Flow Hedging | Foreign Currency Contracts |  |  |
Derivative [Line Items] |  |  |
Notional Amount | 328 | 381 |
Cash Flow Hedging | Commodity Contracts |  |  |
Derivative [Line Items] |  |  |
Notional Amount | $ 16 | 20 |
Designated as Hedging Instrument | Fair Value Hedging | Interest Rate Swaps |  |  |
Derivative [Line Items] |  |  |
Notional Amount |  |  | $ 1,100
Derivatives, Hedge Discontinuances, Termination of Hedging Instrument, Amount |  | 163 |
Designated as Hedging Instrument | Cash Flow Hedging | Interest Rate Swaps |  |  |
Derivative [Line Items] |  |  |
Notional Amount |  | $ 200 |

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