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Retirement Plans - Reconciliation of Changes In Pension And Postretirement Healthcare Plans Benefit Obligations And Fair Value Of Assets (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 28, 2018 | Feb. 28, 2018 | May 31, 2018 | May 31, 2017 | May 31, 2016
U.S. Plans [Member] |  |  |  |  |
Change in Plan Assets |  |  |  |  |
Company contributions | $ 1,500 | $ 1,500 | $ 2,500 | $ 2,000 |
Pension Plans [Member] |  |  |  |  |
Changes in Projected Benefit Obligation (“PBO”) and Accumulated Postretirement Benefit Obligation (“APBO”) |  |  |  |  |
PBO/APBO at the beginning of year |  |  | 29,913 |  |
PBO/APBO at the end of year |  |  | 24,820 | 29,913 |
Change in Plan Assets |  |  |  |  |
Balance at beginning of year |  |  | 26,312 |  |
Balance at end of year |  |  | 23,566 | 26,312 |
Funded Status of the Plans |  |  | (1,254) | (3,601) |
Pension Plans [Member] | U.S. Plans [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Accumulated Benefit Obligation (“ABO”) |  |  | 22,029 | 27,244 |
Changes in Projected Benefit Obligation (“PBO”) and Accumulated Postretirement Benefit Obligation (“APBO”) |  |  |  |  |
PBO/APBO at the beginning of year |  |  | 27,870 | 27,804 |
Service cost |  |  | 679 | 638 | $ 622
Interest cost |  |  | 1,115 | 1,128 | 1,155
Actuarial loss |  |  | 21 | 571 |
Benefits paid |  |  | (854) | (2,271) |
Settlements |  |  | (6,178) |  |
PBO/APBO at the end of year |  |  | 22,653 | 27,870 | 27,804
Change in Plan Assets |  |  |  |  |
Balance at beginning of year |  |  | 24,933 | 23,017 |
Actual return on plan assets |  |  | 1,609 | 2,167 |
Company contributions |  |  | 2,547 | 2,020 |
Benefits paid |  |  | (854) | (2,271) |
Settlements |  |  | (6,178) |  |
Balance at end of year |  |  | 22,057 | 24,933 | 23,017
Funded Status of the Plans |  |  | (596) | (2,937) |
Amount Recognized in the Balance Sheet at May 31: |  |  |  |  |
Current pension, postretirement healthcare and other benefit obligations |  |  | (22) | (33) |
Noncurrent pension, postretirement healthcare and other benefit obligations |  |  | (574) | (2,904) |
Net amount recognized |  |  | (596) | (2,937) |
Amounts Recognized in AOCI and not yet reflected in Net Periodic Benefit Cost: |  |  |  |  |
Prior service (credit) cost and other |  |  | (292) | (410) |
Defined Benefit Plan Amounts That Will Be Amortized From Accumulated Other Comprehensive Income Loss In Next Fiscal Year Abstract |  |  |  |  |
Prior service credit and other |  |  | (118) | (118) |
Pension Plans [Member] | International Plans [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Accumulated Benefit Obligation (“ABO”) |  |  | 1,956 | 1,842 |
Changes in Projected Benefit Obligation (“PBO”) and Accumulated Postretirement Benefit Obligation (“APBO”) |  |  |  |  |
PBO/APBO at the beginning of year |  |  | 2,043 | 1,798 |
Service cost |  |  | 97 | 83 | 40
Interest cost |  |  | 49 | 43 | 25
Actuarial loss |  |  | (34) | 161 |
Benefits paid |  |  | (46) | (38) |
Settlements |  |  | (5) | (7) |
Purchase accounting adjustment |  |  |  | 26 |
Other |  |  | 63 | (23) |
PBO/APBO at the end of year |  |  | 2,167 | 2,043 | 1,798
Change in Plan Assets |  |  |  |  |
Balance at beginning of year |  |  | 1,379 | 1,254 |
Actual return on plan assets |  |  | 49 | 112 |
Company contributions |  |  | 84 | 95 |
Benefits paid |  |  | (46) | (38) |
Settlements |  |  | (5) | (7) |
Other |  |  | 48 | (37) |
Balance at end of year |  |  | 1,509 | 1,379 | 1,254
Funded Status of the Plans |  |  | (658) | (664) |
Amount Recognized in the Balance Sheet at May 31: |  |  |  |  |
Noncurrent asset |  |  | 73 | 40 |
Current pension, postretirement healthcare and other benefit obligations |  |  | (16) | (17) |
Noncurrent pension, postretirement healthcare and other benefit obligations |  |  | (715) | (687) |
Net amount recognized |  |  | (658) | (664) |
Amounts Recognized in AOCI and not yet reflected in Net Periodic Benefit Cost: |  |  |  |  |
Prior service (credit) cost and other |  |  | (10) | (13) |
Defined Benefit Plan Amounts That Will Be Amortized From Accumulated Other Comprehensive Income Loss In Next Fiscal Year Abstract |  |  |  |  |
Prior service credit and other |  |  | (2) | (2) |
Postretirement Healthcare Plans [Member] |  |  |  |  |
Changes in Projected Benefit Obligation (“PBO”) and Accumulated Postretirement Benefit Obligation (“APBO”) |  |  |  |  |
PBO/APBO at the beginning of year |  |  | 927 | 905 |
Service cost |  |  | 36 | 36 | 40
Interest cost |  |  | 39 | 39 | 42
Actuarial loss |  |  | (9) | (14) |
Benefits paid |  |  | (80) | (72) |
Other |  |  | 42 | 33 |
PBO/APBO at the end of year |  |  | 955 | 927 | $ 905
Change in Plan Assets |  |  |  |  |
Company contributions |  |  | 42 | 36 |
Benefits paid |  |  | (80) | (72) |
Other |  |  | 38 | 36 |
Funded Status of the Plans |  |  | (955) | (927) |
Amount Recognized in the Balance Sheet at May 31: |  |  |  |  |
Current pension, postretirement healthcare and other benefit obligations |  |  | (62) | (39) |
Noncurrent pension, postretirement healthcare and other benefit obligations |  |  | (893) | (888) |
Net amount recognized |  |  | (955) | (927) |
Amounts Recognized in AOCI and not yet reflected in Net Periodic Benefit Cost: |  |  |  |  |
Prior service (credit) cost and other |  |  | $ 2 | $ (4) |

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- Definition Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(6) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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Name: | us-gaap_RetirementPlanTypeAxis=us-gaap_DefinedBenefitPostretirementHealthCoverageMember
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Data Type: | na
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