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Shareholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions |  |  |  |  |  |  |  | 2 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 13, 2023 | Nov. 02, 2023 | Oct. 31, 2023 | Aug. 16, 2023 | Feb. 28, 2023 | Jan. 13, 2023 | Dec. 23, 2022 | Feb. 28, 2023 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Dec. 31, 2023 | Sep. 30, 2023 | Mar. 31, 2023 | Dec. 23, 2022 | Mar. 31, 2024 | Mar. 31, 2023
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of treasury shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 750 | $ 1,500
$250 million share repurchase program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of treasury shares |  |  |  |  |  |  |  |  | $ 250 |  |  | $ 250 |  |  |  |  |  |  |  |
$300 million share repurchase program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of treasury shares |  |  |  |  |  |  |  |  |  |  |  |  | $ 250 |  |  |  |  |  |  |
$500 million share repurchase program [Domain] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of treasury shares |  |  |  |  |  |  |  |  |  | $ 500 | $ 500 |  |  | $ 1,000 |  |  |  |  |  |
Treasury Stock, Common |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of treasury shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 750 | $ 1,500
Treasury Stock, Shares, Acquired |  |  |  |  |  |  |  |  |  |  |  | (4.0) |  |  |  |  |  |  | (9.0) | (20.0)
Treasury Stock, Common | $250 million share repurchase program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired | (0.4) |  |  |  | (0.6) |  |  |  | (2.0) |  |  | (2.6) |  |  |  |  |  |  |  |
Treasury shares acquired, average price per share (in usd per share) |  | $ 101.66 |  |  |  |  |  | $ 77.27 | $ 103.67 |  |  | $ 77.03 |  |  |  |  |  |  |  |
Treasury Stock, Common | $300 million share repurchase program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired |  |  |  |  |  | (0.6) |  |  |  |  |  |  | (2.6) |  |  |  |  |  |  |
Treasury shares acquired, average price per share (in usd per share) |  |  |  |  |  |  |  |  |  |  |  |  | $ 76.58 |  |  |  | $ 77.50 |  |  |
Treasury Stock, Common | $500 million share repurchase program [Domain] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired |  |  | (1.3) | (0.9) |  |  | (1.6) |  |  | (4.4) | (4.6) |  |  | (12.0) |  |  |  |  |  |
Treasury shares acquired, average price per share (in usd per share) |  |  |  |  |  |  |  |  |  | $ 90.57 | $ 87.18 |  |  | $ 66.74 | $ 88.22 | $ 91.15 |  | $ 73.36 |  |

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