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Derivative Instruments and Hedging Activities - Effect of Derivative Instruments Designated as Cash Flow Hedges and Not Designated as Hedges on Consolidated Statement of Income (Loss) (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Derivatives not designated as hedges | Foreign exchange contracts | Cost of services/sales |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Gain (Loss) Recognized in Income | $ (32) | $ 11 | $ (26) | $ 2
Cash Flow Hedging | Derivatives designated as hedges |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Gain (Loss) Recognized in Income | 41 | 88 | (173) | 145
Cash Flow Hedging | Derivatives designated as hedges | Cross currency swaps | Cost of services/sales |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Gain (Loss) Recognized in Income | 38 | 92 | (178) | 150
Cash Flow Hedging | Derivatives designated as hedges | Foreign exchange contracts | Cost of services/sales |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Gain (Loss) Recognized in Income | $ 3 | $ (4) | $ 5 | $ (5)

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5618551-113959 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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