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Accumulated Other Comprehensive Loss - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Feb. 29, 2020 | Feb. 28, 2019 | Feb. 29, 2020 | Feb. 28, 2019
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |
Beginning Balance |  |  |  | $ 17,757 |
Translation adjustments |  | $ (1) | $ 103 | (12) | $ (90)
Ending Balance |  | 18,831 | 19,894 | 18,831 | 19,894
Foreign Currency Translation Loss [Member] |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |
Beginning Balance |  | (964) | (952) | (954) | (759)
Translation adjustments |  | (1) | 103 | (12) | (90)
Ending Balance |  | (965) | (849) | (965) | (849)
Foreign Currency Translation Loss [Member] | ASU 2018-02 [Member] |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |
Reclassification to retained earnings due to the adoption of ASU 2018-02 |  |  |  | 1 |
Retirement Plans Adjustments [Member] |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |
Beginning Balance |  | 98 | 135 | 89 | 181
Reclassifications from AOCI |  | (20) | (23) | (61) | (69)
Ending Balance |  | 78 | 112 | 78 | 112
Retirement Plans Adjustments [Member] | ASU 2018-02 [Member] |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |
Reclassification to retained earnings due to the adoption of ASU 2018-02 |  |  |  | 50 |
Accumulated Other Comprehensive (Loss) [Member] |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |
Beginning Balance |  | (866) | (817) | (865) | (578)
Ending Balance |  | $ (887) | $ (737) | (887) | $ (737)
Accumulated Other Comprehensive (Loss) [Member] | ASU 2018-02 [Member] |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |
Reclassification to retained earnings due to the adoption of ASU 2018-02 | [1] |  |  | $ 51 |
[1] | Relates to the adoption of ASU 2018-02.

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- Definition Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -Subparagraph (b,c) -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + Details
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- Definition Amount after tax of reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 17B -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL34724394-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=118951672&loc=d3e1436-108581 + Details
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