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Fair Value Measurements - Debt Securities, Trading, and Equity Securities, FV-NI (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Deferred compensation plan assets |  |  |  |
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items] |  |  |  |
Equity securities, FV-NI, unrealized gain (loss) | $ 0 | $ 1 | $ 7 | $ 6
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) | $ 4 | $ 11 | $ 43 | $ 34

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