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Fair Value Measurements - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2018
Fair Value Disclosures [Abstract] |  |  |
Gains (loss) related to deferred compensation investments | $ (4) | $ 4 |
Other financial instruments [Abstract] |  |  |
Long-term Debt, Carrying Value | 2,306 |  | $ 2,307
Long-term Debt, Fair Value | 2,331 |  | $ 2,372
Accounting Standards Update 2016-01 | Reclassified from AOCI to Retained Earnings [Member] |  |  |
Restricted Investment [Abstract] |  |  |
Unrealized gains on equity securities | 54 |  |
Deferred income taxes | $ 20 |  |

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