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Risk Management and Derivatives - Effects Of Cash Flow Hedges in Statement of Income (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
May 31, 2020 | May 31, 2019 | May 31, 2018
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Revenues | $ 37,403 | $ 39,117 | $ 36,397
Cost of sales | 21,162 | 21,643 | 20,441
Demand creation expense | 3,592 | 3,753 | 3,577
Other (income) expense, net | 139 | (78) | 66
Interest expense (income), net | 89 | 49 | 54
Cash Flow Hedging |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax | 519 | 76 | (131)
Foreign exchange forwards and options | Revenue | Cash Flow Hedging |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax | (17) | (5) | 34
Foreign exchange forwards and options | Cost of sales | Cash Flow Hedging |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax | 364 | 53 | (90)
Foreign exchange forwards and options | Demand creation expense | Cash Flow Hedging |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax | (2) | 0 | 1
Foreign exchange forwards and options | Other (income) expense, net | Cash Flow Hedging |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax | 181 | 35 | (69)
Interest rate swaps | Interest (income) expense, net | Cash Flow Hedging |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax | $ (7) | $ (7) | $ (7)

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- Definition The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(a),(d)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 + Details
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