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Fair Value Measurements - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Mar. 31, 2022 | Mar. 31, 2021 | Sep. 30, 2021
Fair Value [Line Items] |  |  |  |  |
Fair value of long term debt | $ 7,700 |  | $ 7,700 |  | $ 8,500
Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair Value [Line Items] |  |  |  |  |
Fair value of long term debt | 7,500 |  | 7,500 |  | 8,300
Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair Value [Line Items] |  |  |  |  |
Fair value of long term debt | 200 |  | 200 |  | $ 200
Deferred compensation plan assets [Member] |  |  |  |  |
Fair Value [Line Items] |  |  |  |  |
Unrealized gains (losses) | (3) | $ 2 | 0 | $ 7 |
Exchange Traded Funds |  |  |  |  |
Fair Value [Line Items] |  |  |  |  |
Unrealized gains (losses) | $ (20) | $ 2 | $ (6) | $ 23 |

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