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Derivative Instruments and Hedging Activities (Tables) | 12 Months Ended
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Dec. 31, 2018
Derivative Instruments And Hedging Activities Disclosure [Abstract] |
Effect of Derivative Instruments Designated as Fair Value Hedges and Not Designated as Hedges on Consolidated Statement of Income (Loss) | The effect of derivative instruments designated as fair value hedges and those not designated as hedges on the Consolidated Statement of Income (Loss) was as follows:
|  |  |  |  | (Stated in millions) |  |  |
| Gain (Loss) Recognized in Income (Loss) |  |  |
| 2018 |  |  | 2017 |  |  | 2016 |  |  | Consolidated Statement of Income (Loss) Classification
Derivatives designated as fair value hedges: |  |  |  |  |  |  |  |  |  |  |  |  |
Cross currency swap | $ | (25 | ) |  | $ | 73 |  |  | $ | (31 | ) |  | Interest expense
Derivatives designated as cash flow hedges: |  |  |  |  |  |  |  |  |  |  |  |  |
Cross currency swap | $ | 80 |  |  | $ | (8 | ) |  | $ | - |  |  | Interest expense
Foreign exchange contracts |  | (1 | ) |  |  | - |  |  |  | - |  |  | Cost of services/sales
| $ | 79 |  |  | $ | (8 | ) |  | $ | - |  |  |
Derivatives not designated as hedges: |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign exchange contracts | $ | 40 |  |  | $ | (26 | ) |  | $ | (246 | ) |  | Cost of services/sales

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4E -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624181-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + Details
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