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Retirement Plans - Schedule of Weighted-Average Asset Allocations for U.S Pension Plans and International Pension Plans (Details) - Pension Plans [Member] - USD ($) $ in Millions | May 31, 2018 | May 31, 2017 | May 31, 2016
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair Value of Plan Assets |  | $ 23,566 | $ 26,312 |
U.S. Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair Value of Plan Assets |  | $ 22,057 | $ 24,933 | $ 23,017
Actual % |  | 100.00% | 100.00% |
International Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair Value of Plan Assets |  | $ 1,509 | $ 1,379 | 1,254
Portion of Fair Value of Plan Assets |  | $ 1,320 | $ 1,206 |
Actual % |  | 100.00% | 100.00% |
Fair Value Inputs Level 1 [Member] | U.S. Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair Value of Plan Assets |  | $ 4,258 | $ 4,429 |
Fair Value Inputs Level 1 [Member] | International Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Portion of Fair Value of Plan Assets |  | 104 | 95 |
Fair Value Inputs Level 2 [Member] | U.S. Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair Value of Plan Assets |  | 10,164 | 12,955 |
Fair Value Inputs Level 2 [Member] | International Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Portion of Fair Value of Plan Assets |  | 418 | 398 |
Fair Value Inputs Level 3 [Member] | U.S. Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair Value of Plan Assets |  | 209 | 129 | $ 48
Cash And Cash Equivalents [Member] | U.S. Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair Value of Plan Assets |  | $ 714 | $ 1,076 |
Actual % |  | 3.00% | 4.00% |
Cash And Cash Equivalents [Member] | U.S. Plans [Member] | Minimum [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target % | [1] | 0.00% | 0.00% |
Cash And Cash Equivalents [Member] | U.S. Plans [Member] | Maximum [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target % | [1] | 5.00% | 5.00% |
Cash And Cash Equivalents [Member] | International Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Portion of Fair Value of Plan Assets |  | $ 24 | $ 48 |
Actual % |  | 2.00% | 4.00% |
Cash And Cash Equivalents [Member] | Fair Value Inputs Level 1 [Member] | U.S. Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair Value of Plan Assets |  | $ 19 | $ 26 |
Cash And Cash Equivalents [Member] | Fair Value Inputs Level 1 [Member] | International Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Portion of Fair Value of Plan Assets |  | 2 | 2 |
Cash And Cash Equivalents [Member] | Fair Value Inputs Level 2 [Member] | U.S. Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair Value of Plan Assets |  | 695 | 1,050 |
Cash And Cash Equivalents [Member] | Fair Value Inputs Level 2 [Member] | International Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Portion of Fair Value of Plan Assets |  | 22 | 46 |
U.S. Large Cap Equity [Member] | U.S. Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair Value of Plan Assets | [2] | $ 2,449 | $ 2,415 |
Actual % | [2] | 11.00% | 10.00% |
U.S. Large Cap Equity [Member] | Fair Value Inputs Level 1 [Member] | U.S. Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair Value of Plan Assets | [2] | $ 840 | $ 830 |
International Equity Securities [Member] | U.S. Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair Value of Plan Assets | [2] | $ 3,506 | $ 3,521 |
Actual % | [2] | 16.00% | 14.00% |
International Equity Securities [Member] | International Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Portion of Fair Value of Plan Assets | [2] | $ 146 | $ 137 |
Actual % | [2] | 11.00% | 11.00% |
International Equity Securities [Member] | Fair Value Inputs Level 1 [Member] | U.S. Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair Value of Plan Assets | [2] | $ 2,681 | $ 2,747 |
International Equity Securities [Member] | Fair Value Inputs Level 2 [Member] | U.S. Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair Value of Plan Assets | [2] | 172 | 157 |
International Equity Securities [Member] | Fair Value Inputs Level 2 [Member] | International Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Portion of Fair Value of Plan Assets | [2] | 70 | 72 |
Global Equity Funds [Member] | U.S. Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair Value of Plan Assets | [2] | $ 1,772 | $ 3,276 |
Actual % | [2] | 8.00% | 13.00% |
Global Equity Funds [Member] | International Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Portion of Fair Value of Plan Assets | [2] | $ 228 | $ 202 |
Actual % | [2] | 17.00% | 17.00% |
U.S. SMID Cap Equity [Member] | U.S. Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair Value of Plan Assets |  | $ 780 | $ 987 |
Actual % |  | 4.00% | 4.00% |
U.S. SMID Cap Equity [Member] | Fair Value Inputs Level 1 [Member] | U.S. Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair Value of Plan Assets |  | $ 780 | $ 987 |
Corporate Fixed Income Securities [Member] | U.S. Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair Value of Plan Assets |  | $ 5,834 | $ 8,163 |
Actual % |  | 26.00% | 33.00% |
Corporate Fixed Income Securities [Member] | International Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Portion of Fair Value of Plan Assets | [2] | $ 306 | $ 270 |
Actual % | [2] | 23.00% | 22.00% |
Corporate Fixed Income Securities [Member] | Fair Value Inputs Level 2 [Member] | U.S. Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair Value of Plan Assets |  | $ 5,834 | $ 8,163 |
Corporate Fixed Income Securities [Member] | Fair Value Inputs Level 2 [Member] | International Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Portion of Fair Value of Plan Assets | [2] | 68 | 49 |
Government Fixed Income Securities [Member] | U.S. Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair Value of Plan Assets | [2] | $ 4,872 | $ 4,674 |
Actual % | [2] | 22.00% | 19.00% |
Government Fixed Income Securities [Member] | International Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Portion of Fair Value of Plan Assets | [2] | $ 452 | $ 405 |
Actual % | [2] | 34.00% | 34.00% |
Government Fixed Income Securities [Member] | Fair Value Inputs Level 1 [Member] | International Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Portion of Fair Value of Plan Assets | [2] | $ 108 | $ 95 |
Government Fixed Income Securities [Member] | Fair Value Inputs Level 2 [Member] | U.S. Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair Value of Plan Assets | [2] | 3,345 | 3,454 |
Government Fixed Income Securities [Member] | Fair Value Inputs Level 2 [Member] | International Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Portion of Fair Value of Plan Assets | [2] | 256 | 230 |
Mortgage Backed And Other Fixed Income Securities [Member] | U.S. Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair Value of Plan Assets | [2] | $ 626 | $ 603 |
Actual % | [2] | 3.00% | 2.00% |
Mortgage Backed And Other Fixed Income Securities [Member] | International Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Portion of Fair Value of Plan Assets | [2] | $ 168 | $ 145 |
Actual % | [2] | 13.00% | 12.00% |
Mortgage Backed And Other Fixed Income Securities [Member] | Fair Value Inputs Level 2 [Member] | U.S. Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair Value of Plan Assets | [2] | $ 125 | $ 129 |
Alternative investments [Member] | U.S. Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair Value of Plan Assets | [2] | $ 1,573 | $ 377 |
Actual % | [2] | 7.00% | 2.00% |
Alternative investments [Member] | U.S. Plans [Member] | Minimum [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target % | [1],[2] | 0.00% | 0.00% |
Alternative investments [Member] | U.S. Plans [Member] | Maximum [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target % | [1],[2] | 10.00% | 5.00% |
Alternative investments [Member] | International Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Portion of Fair Value of Plan Assets |  | $ 19 | $ 17 |
Actual % |  | 2.00% | 1.00% |
Alternative investments [Member] | Fair Value Inputs Level 2 [Member] | International Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Portion of Fair Value of Plan Assets |  | $ 19 | $ 17 |
Alternative investments [Member] | Fair Value Inputs Level 3 [Member] | U.S. Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair Value of Plan Assets | [2] | 209 | 129 |
Other [Member] | U.S. Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair Value of Plan Liabilities |  | (69) | $ (159) |
Actual % |  |  | (1.00%) |
Other [Member] | International Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Portion of Fair Value of Plan Liabilities |  | $ (23) | $ (18) |
Actual % |  | (2.00%) | (1.00%) |
Other [Member] | Fair Value Inputs Level 1 [Member] | U.S. Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair Value of Plan Liabilities |  | $ (62) | $ (161) |
Other [Member] | Fair Value Inputs Level 1 [Member] | International Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Portion of Fair Value of Plan Liabilities |  | (6) | (2) |
Other [Member] | Fair Value Inputs Level 2 [Member] | U.S. Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair Value of Plan Assets |  |  | 2 |
Fair Value of Plan Liabilities |  | (7) |  |
Other [Member] | Fair Value Inputs Level 2 [Member] | International Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Portion of Fair Value of Plan Liabilities |  | $ (17) | $ (16) |
Total Equities [Member] | U.S. Plans [Member] | Minimum [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target % | [1] | 30.00% | 30.00% |
Total Equities [Member] | U.S. Plans [Member] | Maximum [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target % | [1] | 50.00% | 50.00% |
Total Fixed Income Securities [Member] | U.S. Plans [Member] | Minimum [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target % | [1] | 50.00% | 50.00% |
Total Fixed Income Securities [Member] | U.S. Plans [Member] | Maximum [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target % | [1] | 70.00% | 70.00% |
[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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