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Earnings per Share (EPS) and Common Stock - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2025 | Mar. 31, 2024 | Oct. 01, 2024 | Sep. 30, 2024
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |
Anti-dilutive shares | 300,000 | 100,000 | 200,000 | 100,000 |  |
Common stock, shares authorized | 500,000,000 |  | 500,000,000 |  |  | 500,000,000
Stock repurchased during period (in shares) | 500,000 | 0 | 800,000 | 0 |  |
Stock repurchased during period, value | $ 75 |  | $ 150 |  |  |
Maximum [Member] |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |
Common stock, shares authorized | 500,000,000 |  | 500,000,000 |  |  |
Stock authorized to repurchase |  |  |  |  | $ 2,000 |

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