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Schedule II - Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2016
Valuation and Qualifying Accounts [Abstract] |
Schedule II - Valuation and Qualifying Accounts | Schedule II—Valuation and Qualifying Accounts (Dollars in millions)
Year Ended December 31, | 2016 | 2015 | 2014
Accounts Receivable—Allowance for Doubtful Receivables |  |  |  |  |  |
Balance at beginning of period | $ | 225 |  | $ | 235 |  | $ | 262 |
Additions charged to expenses | 119 |  | 58 |  | 58 |
Deductions from reserves 1 | (57 | ) | (68 | ) | (85 | )
Balance at end of period | $ | 287 |  | $ | 225 |  | $ | 235 |
Inventory—Obsolescence Reserve |  |  |
Balance at beginning of period | $ | 237 |  | $ | 180 |  | $ | 212 |
Additions charged to expenses | 298 |  | 391 |  | 386 |
Deductions from reserves 2 | (320 | ) | (334 | ) | (418 | )
Balance at end of period | $ | 215 |  | $ | 237 |  | $ | 180 |
Deferred Tax Assets—Valuation Allowance |  |  |  |  |  |
Balance at beginning of period | $ | 1,529 |  | $ | 1,704 |  | $ | 1,711 |
Net benefits to income tax expense | (184 | ) | (71 | ) | (47 | )
(Deductions) additions to other comprehensive (loss) income | (37 | ) | (104 | ) | 40 |
Balance at end of period | $ | 1,308 |  | $ | 1,529 |  | $ | 1,704 |
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 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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- References No definition available. + Details
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