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Equity Items - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2025 | Dec. 31, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2025 | Mar. 31, 2024 | Sep. 30, 2024 | Jun. 28, 2023
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |
Stock repurchase during period value | $ 100 |  | $ 0 |  | $ 100 | $ 100 |  |
Accrued expenses and other liabilities | $ 209 |  |  |  | 209 |  | $ 256 |
Dividend per common share | $ 40.5 | $ 40.5 | $ 38.5 | $ 38.5 |  |  |  |
2022 Stock Repurchase Program [Member] |  |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |
Stock repurchase program amount outstanding |  |  |  |  |  |  |  | $ 200
2023 Stock Repurchase Program [Member] |  |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |
Aggregate amount of common stock to be repurchased |  |  |  |  |  |  |  | $ 1,000
Stock Repurchase Program, Remaining Repurchase Amount | $ 520 |  |  |  | $ 520 |  |  |

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