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Derivative Instruments and Hedging Activities (Tables) | 3 Months Ended
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Mar. 31, 2021
Derivative Instruments And Hedging Activities Disclosure [Abstract] |
Effect of Derivative Instruments Designated as Cash Flow Hedges and Not Designated as Hedges on Consolidated Statement of (Loss) Income | The effect of derivative instruments designated as cash flow 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) |  |  |
| Three Months |  |  |
| 2021 |  |  | 2020 |  |  | Consolidated Statement of Loss Classification
Derivatives designated as cash flow hedges: |  |  |  |  |  |  |  |  |
Cross currency swaps | $ | (216 | ) |  | $ | 58 |  |  | Cost of services/sales
Foreign exchange contracts |  | 2 |  |  |  | (1 | ) |  | Cost of services/sales
| $ | (214 | ) |  | $ | 57 |  |  |
Derivatives not designated as hedges: |  |  |  |  |  |  |  |  |
Foreign exchange contracts | $ | 6 |  |  | $ | (9 | ) |  | 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=121590274&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=121590274&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=121590274&loc=SL5624171-113959 + Details
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