Income Taxes - Schedule of Deferred Taxes (Details) - USD ($) $ in Millions |
Sep. 30, 2018 |
Sep. 30, 2017 |
|---|---|---|
| DEFERRED INCOME TAX ASSETS: | ||
| Benefit obligations | $ 205 | |
| Net operating losses / credit carryforwards | 951 | |
| Property, plant and equipment | 21 | |
| Other | 0 | |
| Valuation allowance | (919) | |
| Deferred income tax assets | 258 | |
| DEFERRED INCOME TAX LIABILITIES: | ||
| Goodwill and intangible assets | (290) | |
| Other/accrued liabilities | (79) | |
| Deferred income tax liabilities | (369) | |
| Net deferred income tax liabilities | $ (111) | |
| Predecessor | ||
| DEFERRED INCOME TAX ASSETS: | ||
| Benefit obligations | $ 624 | |
| Net operating losses / credit carryforwards | 1,452 | |
| Property, plant and equipment | 43 | |
| Other | 35 | |
| Valuation allowance | (2,152) | |
| Deferred income tax assets | 2 | |
| DEFERRED INCOME TAX LIABILITIES: | ||
| Goodwill and intangible assets | (29) | |
| Other/accrued liabilities | (118) | |
| Deferred income tax liabilities | (147) | |
| Net deferred income tax liabilities | $ (145) |