Fair Value Measurements (Tables)
 12 Months Ended
Sep. 30, 2018
Fair Value Disclosures [Abstract]  
Fair Value Measurements, Recurring and Nonrecurring
Assets and liabilities measured at fair value on a recurring basis as of September 30, 2018 (Successor) and September 30, 2017 (Predecessor) were as follows:
 
Successor
 
 
Predecessor
 
September 30, 2018
 
 
September 30, 2017
 
Fair Value Measurements Using
 
 
Fair Value Measurements Using
(In millions)
Total
 

Level 1
 
Level 2
 
Level 3
 
 
Total
 

Level 1
 
Level 2
 
Level 3
Assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Investments
$
2

 
$
2

 
$
—

 
$
—

 
 
$
1

 
$
1

 
$
—

 
$
—

Interest rate contracts
3

 
—

 
3

 
—

 
 
—

 
—

 
—

 
—

Total assets
$
5

 
$
2

 
$
3

 
$
—

 
 
$
1

 
$
1

 
$
—

 
$
—

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Liabilities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Interest rate contracts
$
7

 
$
—

 
$
7

 
$
—

 
 
$
—

 
$
—

 
$
—

 
$
—

Spoken acquisition Earn-outs
15

 
—

 
—

 
15

 
 
—

 
—

 
—

 
—

Emergence Date Warrants
34

 
—

 
—

 
34

 
 
—

 
—

 
—

 
—

Total liabilities
$
56

 
$
—

 
$
7

 
$
49

 
 
$
—

 
$
—

 
$
—

 
$
—
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis
The following table summarizes the activity for the Company's Level 3 liabilities measured at fair value on a recurring basis:
(In millions)
Emergence Date Warrants
 
Spoken Acquisition Earn-outs
 
Total
September 30, 2017 (Predecessor)
$
—

 
$
—

 
$
—

Issuance of Emergence Date Warrants
17

 
—

 
17

December 15, 2017 (Predecessor)
$
17

 
$
—

 
$
17

 
 
 
 
 
 
 
 
 
 
 
 
December 16, 2017 (Successor)
$
17

 
$
—

 
$
17

Contingent consideration
—

 
14

 
14

Accretion of interest(1)
—

 
1

 
1

Change in fair value(1)
17

 
—

 
17

September 30, 2018 (Successor)
$
34

 
$
15

 
$
49

(1) Changes in fair value of the Emergence Date Warrants and accretion of interest on the Spoken acquisition earn-outs are included in Other income (expense), net.
Fair Value, by Balance Sheet Grouping
The estimated fair values of the amounts borrowed under the Company’s financing agreements at September 30, 2018 (Successor) and September 30, 2017 (Predecessor) are as follows:
 
Successor
 
 
Predecessor
 
September 30, 2018
 
 
September 30, 2017
(In millions)
Principal amount
 
Fair value
 
 
Principal amount
 
Fair value
Term Loan Credit Agreement due December 15, 2024
2,903

 
2,932

 
 
$
—

 
$
—

Convertible 2.25% senior notes due June 15, 2023
350

 
357

 
 
—

 
—

DIP Credit Agreement due January 19, 2018
—

 
—

 
 
725

 
732

First lien debt:
 
 
 
 
 
 
 
 
     Senior secured term B-3 loans
—

 
—

 
 
594

 
503

Senior secured term B-4 loans
—

 
—

 
 
1

 
1

     Senior secured term B-6 loans
—

 
—

 
 
519

 
440

     Senior secured term B-7 loans
—

 
—

 
 
2,012

 
1,709

     7% senior secured notes
—

 
—

 
 
982

 
832

     9% senior secured notes
—

 
—

 
 
284

 
241

Second lien debt:
 
 
 
 
 
 
 
 
     10.50% senior secured notes
—

 
—

 
 
1,440

 
67

Total debt
$
3,253

 
$
3,289

 
 
$
6,557

 
$
4,525