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Risk Management and Derivatives - Additional Information (Detail) - USD ($) |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Oct. 21, 2016 | Nov. 30, 2016 | Nov. 30, 2015 | Nov. 30, 2016 | Nov. 30, 2015 | May 31, 2016
Derivative Instruments and Hedging Activities Disclosure [Line Items] |  |  |  |  |  |
Percentage of anticipated exposures hedged (percent) |  | 100.00% |  | 100.00% |  |
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 |  | $ 454,000,000 |  | $ 454,000,000 |  |
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 |  |
Gain (loss) on fair value hedge ineffectiveness, net |  | 0 | $ 0 | $ 0 | $ 0 |
Amount of ineffectiveness on net investment hedges |  | 0 | $ 0 | 0 | $ 0 |
Collateral received on derivative assets |  | 369,000,000 |  | $ 369,000,000 |  | $ 105,000,000
Minimum |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosure [Line Items] |  |  |  |  |  |
Typical time period that anticipated exposures are hedged against (in months) |  |  |  | 12 months |  |
Minimum fair value of outstanding derivative above which the credit related contingent features require the derivative party to post collateral |  | 50,000,000 |  | $ 50,000,000 |  |
Maximum |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosure [Line Items] |  |  |  |  |  |
Typical time period that anticipated exposures are hedged against (in months) |  |  |  | 24 months |  |
Derivatives designated as cash flow hedges |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosure [Line Items] |  |  |  |  |  |
Total notional amount of outstanding derivatives |  | 10,200,000,000 |  | $ 10,200,000,000 |  |
Embedded derivatives |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosure [Line Items] |  |  |  |  |  |
Total notional amount of outstanding derivatives |  | 248,000,000 |  | 248,000,000 |  |
Interest rate swaps | Derivatives designated as fair value hedges |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosure [Line Items] |  |  |  |  |  |
Total notional amount of outstanding derivatives |  | 0 |  | 0 |  |
Interest rate swaps | Cash and Cash Equivalents |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosure [Line Items] |  |  |  |  |  |
Collateral received on derivative assets |  |  |  |  |  | 0
Foreign exchange forwards and options | Derivatives designated as net investment hedges |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosure [Line Items] |  |  |  |  |  |
Derivative assets (liabilities), at fair value, net |  | 0 |  | 0 |  |
Foreign exchange forwards and options | Cash and Cash Equivalents |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosure [Line Items] |  |  |  |  |  |
Collateral received on derivative assets |  | 369,000,000 |  | 369,000,000 |  | $ 105,000,000
Undesignated derivative instruments |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosure [Line Items] |  |  |  |  |  |
Total notional amount of outstanding derivatives |  | 7,200,000,000 |  | 7,200,000,000 |  |
Derivatives formally designated as hedging instruments | Interest rate swaps | Derivatives designated as cash flow hedges |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosure [Line Items] |  |  |  |  |  |
Total notional amount of outstanding derivatives |  | $ 1,500,000,000.0 |  | $ 1,500,000,000.0 |  |
Derivative, cash received on hedge | $ 92,000,000 |  |  |  |  |

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- 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 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=64837297&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=51825145&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 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 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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