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Shareholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Class of Stock [Line Items] |  |  |
Payments for Repurchase of Common Stock |  | $ 0 | $ 350
Treasury Shares |  |  |
Class of Stock [Line Items] |  |  |
Treasury Stock, Shares, Acquired | (1.0) |  | (7.0)
Treasury shares acquired, average price per share (in usd per share) |  |  | $ 48.00
Treasury Stock Acquired Shares |  |  | 7.3

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