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Risk Management and Derivatives - Effects Of Cash Flow Hedges in Statement of Income (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Aug. 31, 2018 | Aug. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items] |  |
Revenues | $ 9,948 | $ 9,070
Cost of sales | 5,551 | 5,108
Demand creation expense | 964 | 855
Other expense (income), net | 53 | 18
Interest expense (income), net | 11 | 16
Cash Flow Hedging [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gain (loss) on cash flow hedge activity | (50) | 47
Foreign exchange forwards and options | Revenues | Cash Flow Hedging [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gain (loss) on cash flow hedge activity | 5 | 2
Foreign exchange forwards and options | Cost of sales | Cash Flow Hedging [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gain (loss) on cash flow hedge activity | (44) | 45
Foreign exchange forwards and options | Total selling and administrative expense | Cash Flow Hedging [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gain (loss) on cash flow hedge activity | 0 | 0
Foreign exchange forwards and options | Other expense (income), net | Cash Flow Hedging [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gain (loss) on cash flow hedge activity | (9) | 2
Interest rate swaps | Interest expense (income), net | Cash Flow Hedging [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gain (loss) on cash flow hedge activity | $ (2) | $ (2)

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