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Fair Value Measurements - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Sep. 30, 2020
Fair Value [Line Items] |  |  |  |  |
Fair value of long term debt | $ 8,300 |  | $ 8,300 |  | $ 8,600
Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair Value [Line Items] |  |  |  |  |
Fair value of long term debt | 8,100 |  | 8,100 |  | 8,400
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) | 0 | $ 6 | 7 | $ (1) |
Exchange Traded Funds |  |  |  |  |
Fair Value [Line Items] |  |  |  |  |
Unrealized gains (losses) | $ 16 | $ 31 | $ 39 | $ 9 |

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