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Fair Value Measurements (Tables)
 6 Months Ended
Mar. 31, 2020
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:

(In millions)Fair Value HierarchyMarch 31
2020		September 30
2019
Cash and cash equivalents
Money market fundsLevel 1$293  $—  
Time depositsLevel 2201  59  
Prepaid expenses and other current assets
Currency derivatives (a)
Level 23  —  
Other noncurrent assets
Non-qualified trust fundsLevel 118  20  
Total assets at fair value$515  $79  
Accrued expenses and other liabilities
Currency derivatives (a)
Level 2$3  $—  
Total liabilities at fair value$3  $—  
(a) The Company had outstanding contracts with notional values of $121 million and $111 million as of March 31, 2020 and September 30, 2019, respectively.
Summary of Fair Value of Debt Carrying values shown in the following table are net of unamortized discounts and issuance costs.
March 31, 2020September 30, 2019
(In millions)Fair valueCarrying valueUnamortized discount and
issuance costs		Fair valueCarrying valueUnamortized
discount and
issuance costs
2024 Notes$—  $—  $—  $390  $371  $(4) 
2025 Notes384  396  (4) 407  395  (5) 
2030 Notes560  592  (8) —  —  —  
Total$944  $988  $(12) $797  $766  $(9)