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Risk Management and Derivatives - Additional Information (Detail) - USD ($) | 12 Months Ended
--- | ---
May 31, 2018 | May 31, 2017 | May 31, 2016
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Ineffectiveness for cash flow hedges |  | $ 0 | $ 0
Deferred net gains (net of tax) on both outstanding and matured derivatives accumulated in other comprehensive income are expected to be reclassified to net income during the next twelve months as a result of underlying hedged transactions also being recorded in net income | $ 96,000,000 |  |
Maximum term over which the Company is hedging exposures to the variability of cash flows for its forecasted and recorded transactions (in months) | 24 months |  |
Fair value hedge ineffectiveness |  | 0 | 0
Ineffectiveness on net investment hedges | $ 0 | 0 | $ 0
Derivative, net liability position, aggregate fair value | 0 |  |
Collateral received from counterparties to hedging instruments | 23,000,000 | 0 |
Not designated as derivative instrument |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Total notional amount of outstanding derivatives | 6,100,000,000 |  |
Embedded derivatives |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Total notional amount of outstanding derivatives | 260,000,000 |  |
Minimum |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Minimum fair value of outstanding derivative above which the credit related contingent features require the derivative party to post collateral | $ 50,000,000 |  |
Derivatives designated as cash flow hedges |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Additional period for forecasted transaction expected to occur | 2 months |  |
Percentage of anticipated exposures hedged (percent) | 100.00% |  |
Total notional amount of outstanding derivatives | $ 12,200,000,000 |  |
Derivatives designated as cash flow hedges | Minimum |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Typical time period that anticipated exposures are hedged against (in months) | 12 months |  |
Derivatives designated as cash flow hedges | Maximum |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Typical time period that anticipated exposures are hedged against (in months) | 24 months |  |
Derivatives designated as fair value hedges | Interest rate swaps |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Total notional amount of outstanding derivatives | $ 0 |  |
Fair value hedge ineffectiveness | 0 |  |
Derivatives designated as net investment hedges | Foreign Exchange Contract |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Derivative assets (liabilities), at fair value, net | 0 |  |
Cash and Cash Equivalents |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Collateral received from counterparties to hedging instruments | 23,000,000 |  |
Cash and Cash Equivalents | Foreign Exchange Contract |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Collateral received from counterparties to hedging instruments | $ 23,000,000 | $ 0 |

X
- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition This element represents the typical future period that foreign currency cash flow exposures are hedged against. + References No definition available. + Details
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- Definition This element represents the maximum percentage of anticipated foreign currency cash flow exposures that are hedged. + References No definition available. + Details
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- Definition Gain (loss) on hedging derivative instrument or the foreign currency transaction gain (loss) on the nonderivative hedging instrument designated as a hedge of a net investment in foreign operations related to hedge ineffectiveness, which is included in earnings in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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- Definition Fair value of securities received as collateral against derivative assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226013-175313 + Details
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- Definition Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + 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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- Definition The aggregate fair value amounts of derivative instruments that contain credit-risk-related contingent features that are in a net liability position at the end of the reporting period. For nonderivative instruments that are designated and qualify as hedging instruments, the fair value amounts are the carrying value of the nonderivative hedging instrument, including the adjustment for the foreign currency transaction gain (loss) on that instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624258-113959 + Details
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- Definition The estimated net amount of unrealized gains or losses on foreign currency cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994 + Details
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- Definition The net gain (loss) recognized in earnings during the reporting period representing the amount of the cash flow hedges' ineffectiveness. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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- Definition Amount of gain (loss)recognized in the income statement from the hedging ineffectiveness of a fair value hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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- Definition Maximum amount of time remaining before foreign currency exchange rate derivatives mature or expire, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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