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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, 2023 | Mar. 31, 2022 | Mar. 31, 2023 | Mar. 31, 2022
Deferred compensation plan assets |  |  |  |
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items] |  |  |  |
Equity securities, FV-NI, unrealized gain (loss) | $ 2 | $ (3) | $ 5 | $ 0
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) | $ 12 | $ (20) | $ 23 | $ (6)

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