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Fair Value Measurements - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2021
Fair Value [Line Items] |  |  |
Fair value of long term debt | $ 8,400 |  | $ 8,500
Fair Value, Inputs, Level 1 [Member] |  |  |
Fair Value [Line Items] |  |  |
Fair value of long term debt | 8,200 |  | 8,300
Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Value [Line Items] |  |  |
Fair value of long term debt | 200 |  | $ 200
Deferred compensation plan assets [Member] |  |  |
Fair Value [Line Items] |  |  |
Unrealized gains (losses) | 3 | $ 5 |
Exchange Traded Funds |  |  |
Fair Value [Line Items] |  |  |
Unrealized gains (losses) | $ 14 | $ 21 |

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