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Fair Value Measurements (Tables)
 9 Months Ended
Jun. 30, 2019
Fair Value Disclosures [Abstract]  
Schedule of Assets and Liabilities at Fair Value
The following table sets forth the Company’s financial assets and liabilities that were accounted for at fair value on a recurring basis by level within the fair value hierarchy as of:

(In millions)Fair Value HierarchyJune 30
2019		September 30
2018
Cash and cash equivalents
Money market fundsLevel 1 $3 $5 
Time deposits (a)
Level 2 34 22 
Prepaid expenses and other current assets
Currency derivatives (b)
Level 2 1 1 
Time deposits (a)
Level 2 1 — 
Other noncurrent assets
Non-qualified trust fundsLevel 1 21 25 
Total assets at fair value$60 $53 
Accrued expenses and other liabilities
Currency derivatives (b)
Level 2 $2 $1 
Total liabilities at fair value$2 $1 
(a) Time deposits with original maturities of three months or less are classified within cash equivalents and those with original maturities of one year or less are classified within Prepaid expenses and other current assets.
(b) The Company had outstanding contracts with notional values of $82 million and $74 million as of June 30, 2019 and September 30, 2018, respectively.
Summary of Fair Value of Debt Carrying values shown in the following table are net of unamortized discounts and issuance costs.
June 30, 2019September 30, 2018
(In millions)Fair valueCarrying valueUnamortized discount and
issuance costs		Fair valueCarrying valueUnamortized
discount and
issuance costs
2024 Notes$388 $371 $4 $376 $370 $5 
2025 Notes401 395 5 376 395 5 
Total$789 $766 $9 $752 $765 $10