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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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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

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