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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, 2019 | May 31, 2018 | May 31, 2017
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Revenues | $ 39,117 | $ 36,397 | $ 34,350
Cost of sales | 21,643 | 20,441 | 19,038
Demand creation expense | 3,753 | 3,577 | 3,341
Other (income) expense, net | (78) | 66 | (196)
Interest expense (income), net | 49 | 54 | 59
Cash Flow Hedging |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
AMOUNT OF GAIN (LOSS) ON CASH FLOW HEDGE ACTIVITY | 76 | (131) | 630
Foreign exchange forwards and options | Revenue | Cash Flow Hedging |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
AMOUNT OF GAIN (LOSS) ON CASH FLOW HEDGE ACTIVITY | (5) | 34 | 96
Foreign exchange forwards and options | Cost of sales | Cash Flow Hedging |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
AMOUNT OF GAIN (LOSS) ON CASH FLOW HEDGE ACTIVITY | 53 | (90) | 339
Foreign exchange forwards and options | Demand creation expense | Cash Flow Hedging |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
AMOUNT OF GAIN (LOSS) ON CASH FLOW HEDGE ACTIVITY | 0 | 1 | 0
Foreign exchange forwards and options | Other (income) expense, net | Cash Flow Hedging |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
AMOUNT OF GAIN (LOSS) ON CASH FLOW HEDGE ACTIVITY | 35 | (69) | 199
Interest rate swaps | Interest (income) expense, net | Cash Flow Hedging |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
AMOUNT OF GAIN (LOSS) ON CASH FLOW HEDGE ACTIVITY | $ (7) | $ (7) | $ (4)

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