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Fair Value Measurements (Tables)
 12 Months Ended
Sep. 30, 2018
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 September 30:
(In millions)
 
Fair Value Hierarchy
 
2018
 
2017
Cash and cash equivalents
 
 
 
 
 
 
Money market funds
 
Level 1
 
$
5

 
$
11

Time deposits
 
Level 2
 
22

 
35

Prepaid expenses and other current assets
 
 
 
 
 
 
Currency derivatives
 
Level 2
 
1

 
1

Other noncurrent assets
 
 
 
 
 
 
Non-qualified trust funds
 
Level 1
 
25

 
30

Total assets at fair value
 
 
 
$
53

 
$
77

 
 
 
 
 
 
 
Accrued expenses and other liabilities
 
 
 
 
 
 
Currency derivatives
 
Level 2
 
$
1

 
$
1

Total liabilities at fair value
 
 
 
$
1

 
$
1
Summary of Fair Value of Debt
Carrying values shown in the following table are net of unamortized discounts and issuance costs.
 
 
September 30, 2018
 
September 30, 2017
(In millions)
 
Fair value
 
Carrying value
 
Unamortized discount and issuance costs
 
Fair value
 
Carrying value
 
Unamortized discount and issuance costs
2024 Notes
 
$
376

 
$
370

 
$
(5
)
 
$
401

 
$
370

 
$
(5
)
2025 Notes
 
376

 
395

 
(5
)
 
408

 
394

 
(6
)
Total
 
$
752

 
$
765

 
$
(10
)
 
$
809

 
$
764

 
$
(11
)