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Risk Management and Derivatives - Additional Information (Detail) - USD ($) | 3 Months Ended |
--- | --- | ---
Aug. 31, 2016 | Aug. 31, 2015 | May 31, 2016
Derivative Instruments and Hedging Activities Disclosure [Line Items] |  |  |
Equity | $ 189,000,000 | $ 190,000,000 |
Percentage of anticipated exposures hedged (percent) | 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 | $ 302,000,000 |  |
Maximum term over which the Company is hedging exposures to the variability of cash flows for its forecasted and recorded transactions (in months) | 27 months |  |
Gain (loss) on fair value hedge ineffectiveness, net | $ 0 | 0 |
Amount o ineffectiveness on net investment hedges | 0 | 0 |
Derivative instruments in a net liability position | $ 96,000,000 |  |
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 |  |
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 | $ 11,300,000,000 |  |
Cash and Cash Equivalents |  |  |
Derivative Instruments and Hedging Activities Disclosure [Line Items] |  |  |
Collateral posted on derivative liabilities | 31,000,000 |  |
Embedded derivatives |  |  |
Derivative Instruments and Hedging Activities Disclosure [Line Items] |  |  |
Total notional amount of outstanding derivatives | 294,000,000 |  |
Interest rate swaps | Derivatives designated as fair value hedges |  |  |
Derivative Instruments and Hedging Activities Disclosure [Line Items] |  |  |
Total notional amount of outstanding derivatives | 0 |  |
Interest rate swaps | Cash and Cash Equivalents |  |  |
Derivative Instruments and Hedging Activities Disclosure [Line Items] |  |  |
Collateral posted on derivative liabilities | 8,000,000 |  | $ 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 |  |
Foreign exchange forwards and options | Cash and Cash Equivalents |  |  |
Derivative Instruments and Hedging Activities Disclosure [Line Items] |  |  |
Collateral posted on derivative liabilities | 23,000,000 |  | $ 0
Undesignated derivative instruments |  |  |
Derivative Instruments and Hedging Activities Disclosure [Line Items] |  |  |
Total notional amount of outstanding derivatives | 7,700,000,000 |  |
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 |  |
Cash Flow Hedges |  |  |
Derivative Instruments and Hedging Activities Disclosure [Line Items] |  |  |
Equity | $ 180,000,000 | 187,000,000 |
Cash Flow Hedges | Revisions |  |  |
Derivative Instruments and Hedging Activities Disclosure [Line Items] |  |  |
Equity |  | $ 40,000,000 |

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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 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=64837297&loc=SL5624171-113959 + 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 Fair value of securities pledged as collateral against derivative liabilities. + 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 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=64837297&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 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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