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Risk Management and Derivatives - FV of Derivative Instruments Included within Consolidated Balance Sheet (Detail) - USD ($) $ in Millions | Aug. 31, 2018 | May 31, 2018
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Derivative Assets | $ 485 | $ 400
Derivative Liabilities | 111 | 190
Derivatives formally designated as hedging instruments |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Assets | 335 | 270
Derivative Liabilities | 72 | 156
Derivatives formally designated as hedging instruments | Foreign exchange forwards and options | Prepaid expenses and other current assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Assets | 207 | 118
Derivatives formally designated as hedging instruments | Foreign exchange forwards and options | Deferred income taxes and other assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Assets | 128 | 152
Derivatives formally designated as hedging instruments | Foreign exchange forwards and options | Accrued liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liabilities | 72 | 156
Derivatives formally designated as hedging instruments | Foreign exchange forwards and options | Deferred income taxes and other liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liabilities | 0 | 0
Derivatives not designated as hedging instruments |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Assets | 150 | 130
Derivative Liabilities | 39 | 34
Derivatives not designated as hedging instruments | Foreign exchange forwards and options | Prepaid expenses and other current assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Assets | 140 | 119
Derivatives not designated as hedging instruments | Foreign exchange forwards and options | Deferred income taxes and other assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Assets | 1 | 0
Derivatives not designated as hedging instruments | Foreign exchange forwards and options | Accrued liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liabilities | 27 | 26
Derivatives not designated as hedging instruments | Foreign exchange forwards and options | Deferred income taxes and other liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liabilities | 0 | 0
Derivatives not designated as hedging instruments | Embedded derivatives | Prepaid expenses and other current assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Assets | 3 | 3
Derivatives not designated as hedging instruments | Embedded derivatives | Deferred income taxes and other assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Assets | 6 | 8
Derivatives not designated as hedging instruments | Embedded derivatives | Accrued liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liabilities | 3 | 2
Derivatives not designated as hedging instruments | Embedded derivatives | Deferred income taxes and other liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liabilities | $ 9 | $ 6

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