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Schedule II - Valuation and Qualifying Accounts (Other) | 12 Months Ended
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Dec. 31, 2017
Valuation and Qualifying Accounts [Abstract] |
Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] | Schedule II—Valuation and Qualifying Accounts (Dollars in millions)
| Successor | Predecessor
| For the Period September 1 through December 31, 2017 | For the Period January 1 through August 31, 2017 | For the Year Ended December 31, 2016 | For the Year Ended December 31, 2015
Accounts Receivable—Allowance for Doubtful Receivables |  |  |  |  |  |  |
Balance at beginning of period | $ | — |  | $ | 287 |  | $ | 225 |  | $ | 235 |
Additions charged to expenses | 10 |  | 51 |  | 119 |  | 58 |
Deductions from reserves 1 | — |  | (33 | ) | (57 | ) | (68 | )
Balance at end of period | $ | 10 |  | $ | 305 |  | $ | 287 |  | $ | 225 |
Inventory—Obsolescence Reserve |  |  |  |
Balance at beginning of period | $ | — |  | $ | 214 |  | $ | 237 |  | $ | 179 |
Additions charged to expenses | 89 |  | 241 |  | 275 |  | 391 |
Deductions from reserves 2 | (34 | ) | (181 | ) | (298 | ) | (333 | )
Balance at end of period | $ | 55 |  | $ | 274 |  | $ | 214 |  | $ | 237 |
Deferred Tax Assets—Valuation Allowance |  |  |  |  |  |
Balance at beginning of period | $ | 1,323 |  | $ | 1,308 |  | $ | 1,529 |  | $ | 1,704 |
Additions charged to expenses | 84 |  | 95 |  | 74 |  | 40 |
Deductions from reserves | (29 | ) | (20 | ) | (295 | ) | (215 | )
Balance at end of period | $ | 1,378 |  | $ | 1,383 |  | $ | 1,308 |  | $ | 1,529 |
1. Deductions include write-offs, recoveries and currency translation adjustments. 2. Deductions include disposals and currency translation adjustments.

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- Definition The entire disclosure for any allowance and reserve accounts (their beginning and ending balances, as well as a reconciliation by type of activity during the period). Alternatively, disclosure of the required information may be within the footnotes to the financial statements or a supplemental schedule to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -URI http://asc.fasb.org/topic&trid=2122369 + Details
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- References No definition available. + Details
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