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Computation of Earnings Per Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended
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Feb. 28, 2015 | Feb. 28, 2014 | Feb. 28, 2015 | Feb. 28, 2014
Basic earnings per common share: |  |  |  |  |  |  |  |
Net earnings allocable to common shares | $ 579 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | [1] | $ 377 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | [1] | $ 1,799 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | [1] | $ 1,365 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | [1]
Weighted-average common shares | 283 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |  | 303 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |  | 284 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |  | 312 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |
Basic earnings per common share | $ 2.05 us-gaap_EarningsPerShareBasic |  | $ 1.24 us-gaap_EarningsPerShareBasic |  | $ 6.34 us-gaap_EarningsPerShareBasic |  | $ 4.38 us-gaap_EarningsPerShareBasic |
Diluted earnings per common share: |  |  |  |  |  |  |  |
Net earnings allocable to common shares | $ 579 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | [1] | $ 377 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | [1] | $ 1,799 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | [1] | $ 1,365 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | [1]
Weighted-average common shares | 283 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |  | 303 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |  | 284 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |  | 312 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |
Dilutive effect of share-based awards | 4 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment |  | 4 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment |  | 4 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment |  | 3 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment |
Weighted-average diluted shares | 287 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |  | 307 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |  | 288 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |  | 315 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |
Diluted earnings per common share | $ 2.01 us-gaap_EarningsPerShareDiluted |  | $ 1.23 us-gaap_EarningsPerShareDiluted |  | $ 6.25 us-gaap_EarningsPerShareDiluted |  | $ 4.34 us-gaap_EarningsPerShareDiluted |
Anti-dilutive options excluded from diluted earnings per common share | 2.0 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount |  | 0.5 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount |  | 2.1 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount |  | 4.3 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount |
[1] | Net earnings available to participating securities were immaterial in all periods presented.

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- Definition The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 18 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 20 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 21 -Article 9 + Details
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- Definition Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1377-109256 + Details
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