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Fair Value Measurements - Debt Securities, Trading, and Equity Securities, FV-NI (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2025 | Mar. 31, 2024
Deferred compensation plan assets |  |  |  |
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items] |  |  |  |
Equity securities, FV-NI, unrealized gain (loss) | $ (1) | $ 3 | $ (2) | $ 7
Investments in exchange traded funds |  |  |  |
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items] |  |  |  |
Equity securities, FV-NI, unrealized gain (loss) | $ (7) | $ 17 | $ (8) | $ 39

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