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Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items] |
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] | The following table summarizes the fair value of derivative instruments as of December 31, 2017 and 2016, which consist solely of foreign exchange contracts:
| Asset Derivatives |  | Liability Derivatives
(dollars in millions) | 2017 |  | 2016 |  | 2017 |  | 2016
Derivatives designated as hedging instruments | $ | 178 |  |  | $ | 15 |  |  | $ | 18 |  |  | $ | 196 |
Derivatives not designated as hedging instruments | 75 |  |  | 155 |  |  | 60 |  |  | 158 |
Reclassification out of Accumulated Other Comprehensive Income [Member] |
Derivative Instruments, Gain (Loss) [Line Items] |
Derivative Instruments, Gain (Loss) [Table Text Block] | The impact from foreign exchange derivative instruments that qualified as cash flow hedges was as follows:
| Year Ended December 31,
(dollars in millions) | 2017 |  | 2016
Gain recorded in Accumulated other comprehensive loss | $ | 347 |  |  | $ | 75 |
(Gain) loss reclassified from Accumulated other comprehensive loss into Product sales (effective portion) | $ | (39 | ) |  | $ | 171 |
Other Operating Income (Expense) [Member] |
Derivative Instruments, Gain (Loss) [Line Items] |
Derivative Instruments, Gain (Loss) [Table Text Block] | The effect on the Consolidated Statement of Operations of foreign exchange contracts not designated as hedging instruments was as follows:
| Year Ended December 31,
(dollars in millions) | 2017 |  | 2016
Gain recognized in Other income, net | $ | 77 |  |  | $ | 56 |

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- Definition Tabular disclosure of the location and amount of derivative instruments and nonderivative instruments designated as hedging instruments reported before netting adjustments, and the amount of gain (loss) on derivative instruments and nonderivative instruments designated and qualified as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5618551-113959 + Details
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- Definition Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 + Details
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