Background and Basis of Presentation (Tables)
 12 Months Ended
Sep. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of Error Corrections and Prior Period Adjustments
The Consolidated Balance Sheet as of December 16, 2017, the Consolidated Statement of Cash Flows for the Predecessor period from October 1, 2017 through December 15, 2017, and the notes thereto have been revised to include the effects of these errors and the cash flow reclassification as follows:
 
December 16, 2017 (Successor)
(In millions, except per share amounts)
As Previously Reported
 
Adjustments
 
Revised
Consolidated Balance Sheet:
 
 
 
 
 
Cash
$
340

 
$
26

 
$
366

Accounts receivable
417

 
(26
)
 
391

Goodwill
2,632

 
26

 
2,658

Total Assets
7,583

 
26

 
7,609

Additional paid-in capital (Successor)
1,641

 
26

 
1,667

Total Stockholders' Equity
1,642

 
26

 
1,668

Total Liabilities and Stockholders' Equity
7,583

 
26

 
7,609

Successor common stock value per share
$
14.93

 
$
0.23

 
$
15.16

 
Period from October 1, 2017 through December 15, 2017 (Predecessor)
(In millions)
As Previously Reported
 
Adjustments
 
Revised
Consolidated Statement of Cash Flows:
 
 
 
 
 
Change in Accounts receivable
$
14

 
$
26

 
$
40

Net gain on settlement of Liabilities subject to compromise
(1,804
)
 
26

 
(1,778
)
Fresh start adjustments
(1,671
)
 
(26
)
 
(1,697
)
Net Cash Used from Operating Activities
(440
)
 
26

 
(414
)
Net decrease in cash and cash equivalents
(536
)
 
26

 
(510
)
For additional information refer to Notes: 5. “Fresh Start Accounting”; 7. “Goodwill”; 9. “Supplementary Financial Information”; and 12. “Derivative Instruments and Hedging Activities”.