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Financial Instruments (Schedule of Outstanding Instruments, Fair Value Hedges) (Details) - Interest Rate Swaps - USD ($) $ in Millions | Jun. 30, 2021 | Jun. 30, 2020
--- | --- | ---
Derivative [Line Items] |  |
Deferred Gain (Loss) on Discontinuation of Interest Rate Fair Value Hedge | $ 18 |
Fair Value Hedging |  |
Derivative [Line Items] |  |
Notional Amount | $ 200 | $ 550
Designated as Hedging Instrument | Fair Value Hedging |  |
Derivative [Line Items] |  |
Deferred Gain (Loss) on Discontinuation of Interest Rate Fair Value Hedge |  | 112
Derivatives, matured notional amounts |  | $ 200

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