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Retirement Plans - Schedule of Weighted-Average Asset Allocations for U.S Pension Plans and International Pension Plans (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
May 31, 2017 | May 31, 2016 | May 31, 2015
U.S. Pension Plans [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair Value of Plan Assets |  | $ 24,933 |  | $ 23,017 |  | $ 23,006
Actual % |  | 100.00% |  | 100.00% |  |
International Pension Plans [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair Value of Plan Assets |  | $ 1,379 |  | $ 1,254 |  | $ 499
Portion of Fair Value of Plan Assets |  | $ 1,206 |  | $ 1,092 |  |
Actual % |  | 100.00% |  | 100.00% |  |
Fair Value Inputs Level 1 [Member] | U.S. Pension Plans [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair Value of Plan Assets |  | $ 4,429 |  | $ 4,119 |  |
Fair Value Inputs Level 1 [Member] | International Pension Plans [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Portion of Fair Value of Plan Assets |  | 95 |  | 203 |  |
Fair Value Inputs Level 2 [Member] | U.S. Pension Plans [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair Value of Plan Assets |  | 12,955 |  | 12,499 |  |
Fair Value Inputs Level 2 [Member] | International Pension Plans [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Portion of Fair Value of Plan Assets |  | 398 |  | 396 |  |
Fair Value Inputs Level 3 [Member] | U.S. Pension Plans [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair Value of Plan Assets |  | 129 |  | 48 |  |
Cash And Cash Equivalents [Member] | U.S. Pension Plans [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair Value of Plan Assets |  | $ 1,076 |  | $ 568 |  |
Actual % |  | 4.00% |  | 2.00% |  |
Target % | [1] | 0 - 5% |  | 0 - 5% |  |
Cash And Cash Equivalents [Member] | International Pension Plans [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Portion of Fair Value of Plan Assets |  | $ 48 |  | $ 211 |  |
Actual % |  | 4.00% |  | 19.00% |  |
Cash And Cash Equivalents [Member] | Fair Value Inputs Level 1 [Member] | U.S. Pension Plans [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair Value of Plan Assets |  | $ 26 |  | $ 76 |  |
Cash And Cash Equivalents [Member] | Fair Value Inputs Level 1 [Member] | International Pension Plans [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Portion of Fair Value of Plan Assets |  | 2 |  | 157 |  |
Cash And Cash Equivalents [Member] | Fair Value Inputs Level 2 [Member] | U.S. Pension Plans [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair Value of Plan Assets |  | 1,050 |  | 492 |  |
Cash And Cash Equivalents [Member] | Fair Value Inputs Level 2 [Member] | International Pension Plans [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Portion of Fair Value of Plan Assets |  | 46 |  | 54 |  |
U.S. Large Cap Equity [Member] | U.S. Pension Plans [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair Value of Plan Assets | [2] | $ 2,415 |  | $ 3,257 |  |
Actual % | [2] | 10.00% |  | 14.00% |  |
U.S. Large Cap Equity [Member] | Fair Value Inputs Level 1 [Member] | U.S. Pension Plans [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair Value of Plan Assets | [2] | $ 830 |  | $ 750 |  |
International Equity Securities [Member] | U.S. Pension Plans [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair Value of Plan Assets | [2] | $ 3,521 |  | $ 3,381 |  |
Actual % | [2] | 14.00% |  | 15.00% |  |
International Equity Securities [Member] | International Pension Plans [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Portion of Fair Value of Plan Assets | [2] | $ 137 |  | $ 124 |  |
Actual % | [2] | 11.00% |  | 11.00% |  |
International Equity Securities [Member] | Fair Value Inputs Level 1 [Member] | U.S. Pension Plans [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair Value of Plan Assets | [2] | $ 2,747 |  | $ 2,685 |  |
International Equity Securities [Member] | Fair Value Inputs Level 2 [Member] | U.S. Pension Plans [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair Value of Plan Assets | [2] | 157 |  | 121 |  |
International Equity Securities [Member] | Fair Value Inputs Level 2 [Member] | International Pension Plans [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Portion of Fair Value of Plan Assets | [2] | 72 |  | 63 |  |
Global Equity Funds [Member] | U.S. Pension Plans [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair Value of Plan Assets | [2] | $ 3,276 |  | $ 2,794 |  |
Actual % | [2] | 13.00% |  | 12.00% |  |
Global Equity Funds [Member] | International Pension Plans [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Portion of Fair Value of Plan Assets | [2] | $ 202 |  | $ 148 |  |
Actual % | [2] | 17.00% |  | 14.00% |  |
U.S. SMID Cap Equity [Member] | U.S. Pension Plans [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair Value of Plan Assets |  | $ 987 |  | $ 913 |  |
Actual % |  | 4.00% |  | 4.00% |  |
U.S. SMID Cap Equity [Member] | Fair Value Inputs Level 1 [Member] | U.S. Pension Plans [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair Value of Plan Assets |  | $ 987 |  | $ 913 |  |
Corporate Fixed Income Securities [Member] | U.S. Pension Plans [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair Value of Plan Assets |  | $ 8,163 |  | $ 6,608 |  |
Actual % |  | 33.00% |  | 29.00% |  |
Corporate Fixed Income Securities [Member] | International Pension Plans [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Portion of Fair Value of Plan Assets | [2] | $ 270 |  | $ 122 |  |
Actual % | [2] | 22.00% |  | 11.00% |  |
Corporate Fixed Income Securities [Member] | Fair Value Inputs Level 2 [Member] | U.S. Pension Plans [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair Value of Plan Assets |  | $ 8,163 |  | $ 6,608 |  |
Corporate Fixed Income Securities [Member] | Fair Value Inputs Level 2 [Member] | International Pension Plans [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Portion of Fair Value of Plan Assets | [2] | 49 |  | 44 |  |
Government Fixed Income Securities [Member] | U.S. Pension Plans [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair Value of Plan Assets |  | $ 4,674 | [2] | $ 5,148 |  |
Actual % |  | 19.00% | [2] | 22.00% |  |
Government Fixed Income Securities [Member] | International Pension Plans [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Portion of Fair Value of Plan Assets | [2] | $ 405 |  | $ 324 |  |
Actual % | [2] | 34.00% |  | 30.00% |  |
Government Fixed Income Securities [Member] | Fair Value Inputs Level 1 [Member] | International Pension Plans [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Portion of Fair Value of Plan Assets | [2] | $ 95 |  | $ 60 |  |
Government Fixed Income Securities [Member] | Fair Value Inputs Level 2 [Member] | U.S. Pension Plans [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair Value of Plan Assets |  | 3,454 | [2] | 5,148 |  |
Government Fixed Income Securities [Member] | Fair Value Inputs Level 2 [Member] | International Pension Plans [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Portion of Fair Value of Plan Assets | [2] | 230 |  | 213 |  |
Mortgage Backed And Other Fixed Income Securities [Member] | U.S. Pension Plans [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair Value of Plan Assets | [2] | $ 603 |  | $ 347 |  |
Actual % | [2] | 2.00% |  | 2.00% |  |
Mortgage Backed And Other Fixed Income Securities [Member] | International Pension Plans [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Portion of Fair Value of Plan Assets | [2] | $ 145 |  | $ 134 |  |
Actual % | [2] | 12.00% |  | 12.00% |  |
Mortgage Backed And Other Fixed Income Securities [Member] | Fair Value Inputs Level 2 [Member] | U.S. Pension Plans [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair Value of Plan Assets | [2] | $ 129 |  | $ 146 |  |
Alternative investments [Member] | U.S. Pension Plans [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair Value of Plan Assets | [2] | $ 377 |  | $ 322 |  |
Actual % | [2] | 2.00% |  | 1.00% |  |
Target % | [1],[2] | 0 - 5 |  | 0 - 5 |  |
Alternative investments [Member] | International Pension Plans [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Portion of Fair Value of Plan Assets |  | $ 17 |  | $ 39 | [2] |
Actual % |  | 1.00% |  | 4.00% | [2] |
Alternative investments [Member] | Fair Value Inputs Level 2 [Member] | International Pension Plans [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Portion of Fair Value of Plan Assets |  | $ 17 |  | $ 18 | [2] |
Alternative investments [Member] | Fair Value Inputs Level 3 [Member] | U.S. Pension Plans [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair Value of Plan Assets | [2] | 129 |  | 48 |  |
Other [Member] | U.S. Pension Plans [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair Value of Plan Assets |  | $ (159) |  | $ (321) |  |
Actual % |  | (1.00%) |  | (1.00%) |  |
Other [Member] | International Pension Plans [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Portion of Fair Value of Plan Assets |  | $ (18) |  | $ (10) |  |
Actual % |  | (1.00%) |  | (1.00%) |  |
Other [Member] | Fair Value Inputs Level 1 [Member] | U.S. Pension Plans [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair Value of Plan Assets |  | $ (161) |  | $ (305) |  |
Other [Member] | Fair Value Inputs Level 1 [Member] | International Pension Plans [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Portion of Fair Value of Plan Assets |  | (2) |  | (14) |  |
Other [Member] | Fair Value Inputs Level 2 [Member] | U.S. Pension Plans [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair Value of Plan Assets |  | 2 |  | (16) |  |
Other [Member] | Fair Value Inputs Level 2 [Member] | International Pension Plans [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Portion of Fair Value of Plan Assets |  | $ (16) |  | $ 4 |  |
Total Equities [Member] | U.S. Pension Plans [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Target % | [1] | 30 - 50 |  | 35 - 55 |  |
Total Fixed Income Securities [Member] | U.S. Pension Plans [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Target % | [1] | 50 - 70 |  | 45 - 65 |  |
[1] | Target ranges have not been provided for international plan assets as they are managed at an individual country level.
[2] | Certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy but are included in the total.

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- Definition Description of target allocation percentages, or range of percentages, considering the major categories of plan assets as of the latest statement of financial position presented (on a weighted-average basis for employers with more than one plan) that are pertinent to an understanding of the plan investment policies and strategies. + 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 (d)(i) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2446-114920 + Details
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