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Retirement Plans (Details 11) - USD ($) $ in Millions | 12 Months Ended
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May. 31, 2015 | May. 31, 2014 | May. 31, 2013
Defined Benefit Plan Amounts Recognized In Other Comprehensive Income [Abstract] |  |  |
Total recognized in OCI, Net of Tax Amount |  | $ 76 | $ 63
Pension Plans [Member] |  |  |
Defined Benefit Plan Amounts Recognized In Other Comprehensive Income [Abstract] |  |  |
Net (gain) loss and other arising during period, Gross Amount | $ (113) | (1) |
Other Comprehensive Income Loss Amortization Adjustment From AOCI Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Before Tax | 115 | 115 |
Total recognized in OCI, Gross Amount | 2 | 114 |
Net (gain) loss and other arising during period, Net of Tax Amount | (72) | (1) |
Other Comprehensive Income Loss Amortization Adjustment From AOCI Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Net Of Tax | 72 | 77 |
Total recognized in OCI, Net of Tax Amount | 0 | $ 76 |
Postretirement Healthcare Plans [Member] |  |  |
Defined Benefit Plan Amounts Recognized In Other Comprehensive Income [Abstract] |  |  |
Net (gain) loss and other arising during period, Gross Amount | (1) |  |
Total recognized in OCI, Gross Amount | $ (1) |  |

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- Definition Amount after tax of (increase) decrease in the value of the projected benefit obligation related to a change in an actuarial assumption and increase (decrease) in the value of the plan assets resulting from experience different from that assumed, that has not been recognized in net periodic benefit (cost) credit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition Amount before tax of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) related to pension and other postretirement benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580 + Details
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