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Retirement Plans - Schedule of Fair Value of Plan Assets for Pension Plans with a PBO or ABO in Excess of Plan Assets (Details) - USD ($) $ in Millions | May 31, 2017 | May 31, 2016
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U.S. Pension Plans [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  | $ 24,933 | $ 23,017
PBO |  | (27,870) | (27,804)
Net funded status |  | (2,937) | (4,787)
ABO | [1] | (27,244) | (27,236)
Fair value of plan assets |  | 24,933 | 23,017
PBO |  | (27,870) | (27,804)
Net funded status |  | (2,937) | (4,787)
International Pension Plans [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  | 952 | 850
PBO |  | (1,656) | (1,447)
Net funded status |  | (704) | (597)
ABO | [1] | (1,433) | (1,257)
Fair value of plan assets |  | 928 | 848
PBO |  | (1,626) | (1,445)
Net funded status |  | $ (698) | $ (597)
[1] | ABO not used in determination of funded status.

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- Definition If aggregate disclosures are presented, the aggregate pension accumulated benefit obligation for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=73719040&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2417-114920 + Details
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