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Shareholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions |  |  |  | 3 Months Ended | 4 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | --- | ---
Dec. 13, 2023 | Nov. 02, 2023 | Oct. 31, 2023 | Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023 | Oct. 30, 2024 | Dec. 31, 2024 | Dec. 31, 2023
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Purchase of treasury shares |  |  |  |  |  |  |  |  | $ 390 | $ 750
Retirement of treasury stock |  |  |  | 0.0 |  |  |  |  | 0.0 |
$250 million share repurchase program [Member] |  |  |  |  |  |  |  |  |  |
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 |  |  |  |
$375 million share repurchase program |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Purchase of treasury shares |  |  |  |  | $ 375 |  |  |  |  |
Treasury Stock, Common |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Purchase of treasury shares |  |  |  |  |  |  |  |  | $ 375 | $ 750
Treasury Stock, Shares, Acquired |  |  |  | 0.0 |  |  | (4.0) |  | (3.0) | (9.0)
Retirement of treasury stock |  |  |  | 56.0 |  |  |  |  | 56.0 |
Treasury Stock, Common | $250 million share repurchase program [Member] |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired | (0.4) | (2.0) |  |  |  |  |  |  |  |
Treasury shares acquired, average price per share (in usd per share) |  | $ 101.66 |  |  |  |  | $ 103.67 |  |  |
Treasury Stock, Common | $500 million share repurchase program [Domain] |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired |  |  | (1.3) |  |  | (4.4) |  |  |  |
Treasury shares acquired, average price per share (in usd per share) |  |  |  |  | $ 88.22 | $ 90.57 |  |  |  |
Treasury Stock, Common | $375 million share repurchase program |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired |  |  |  |  | (2.7) |  |  | (0.7) |  |
Treasury shares acquired, average price per share (in usd per share) |  |  |  |  | $ 109.65 |  |  | $ 110.10 |  |

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