Fresh Start Accounting Reorganization Value (Details) - USD ($) $ in Millions	Sep. 30, 2019	Jul. 01, 2019
Fresh-Start Adjustment [Line Items]
Additional Paid-in Capital	$ 1,162	$ 1,157
Postconfirmation, Stockholders Equity, including portion attributable to non-controlling interest		(1,156)
Enterprise Value	3,100	3,100
Cash and Cash Equivalents		125
Postconfirmation, Non-debt and non-pension current liabilities		540
Postconfirmation, Non-debt and non-pension long-term liabilities		527
Postconfirmation, Total non-debt and non-pension liabilities		1,067
Total liabilities and equity (deficit)		$ 4,292
Minimum [Member]
Fresh-Start Adjustment [Line Items]
Reorganization Value	2,900
Maximum [Member]
Fresh-Start Adjustment [Line Items]
Reorganization Value	$ 3,300