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Financial Instruments (Narrative) (Details) ¥ in Millions, $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 JPY (¥)
Derivative [Line Items] |  |  |  |  |
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments | $ 0 | $ 0 | $ 0 | $ 0 |
Cash Flow Hedging [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative Liability, Notional Amount |  | 100 |  | 100 |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax | 8 |  | 7 |  |
Currency Swap [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative Liability, Notional Amount |  | 600 |  | 600 | ¥ 64,000
Foreign Exchange Contract [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Other Comprehensive Income (Loss), Net Investment Hedge, Gain (Loss), before Reclassification and Tax | (27) | 1 | (52) | 17 |
Interest Income (Expense), Nonoperating, Net | 5 | 5 | 10 | 6 |
Designated as Hedging Instrument | Fair Value Hedging | Interest Rate Swap |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivatives, Hedge Discontinuances, Hedging Instrument Matured, Amount |  | 200 |  | 200 |
Other Nonoperating Income (Expense) [Member] | Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net | $ (4) | $ (2) | $ (5) | $ (7) |

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