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Accumulated Other Comprehensive Income - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
12 Months Ended
May 31, 2018
May 31, 2017
May 31, 2016
Accumulated Other Comprehensive Income Loss [Line Items]      
Beginning balance $ 16,073 $ 13,784 $ 14,993
Translation adjustments (74) (171) (261)
Ending balance 19,416 16,073 13,784
Foreign Currency Translation Gain (Loss) [Member]      
Accumulated Other Comprehensive Income Loss [Line Items]      
Beginning balance (685) (514) (253)
Translation adjustments (74) (171) (261)
Ending balance (759) (685) (514)
Retirement Plans Adjustments [Member]      
Accumulated Other Comprehensive Income Loss [Line Items]      
Beginning balance 270 345 425
Prior service credit and other arising during period (4) 1 (4)
Reclassifications from AOCI (85) (76) (76)
Ending balance 181 270 345
Accumulated Other Comprehensive Income (Loss) [Member]      
Accumulated Other Comprehensive Income Loss [Line Items]      
Beginning balance (415) (169) 172
Ending balance $ (578) $ (415) $ (169)