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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Nov. 30, 2015
Nov. 30, 2014
Nov. 30, 2015
Nov. 30, 2014
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning balance     $ 172  
Translation adjustment $ (33) $ (122) (171) $ (153)
Amortization of prior service credit, net of tax of $11, $11, $18, and $21 (18) (18) (42) (34)
Ending balance (41) 319 (41) 319
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Salaries and employee benefits 4,570 4,229 9,095 8,343
PROVISION FOR INCOME TAXES 364 383 756 742
Amortization of actuarial losses [Member]        
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Salaries and employee benefits 29 29 60 55
Foreign currency translation gain (loss) [Member]        
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning balance (391) 50 (253) 81
Translation adjustment (33) (122) (171) (153)
Ending balance (424) (72) (424) (72)
Retirement plans adjustments [Member]        
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning balance 401 409 425 425
Reclassification from AOCI (18) (18) (42) (34)
Ending balance 383 391 383 391
Reclassification Out Of Accumulated Other Comprehensive Income [Member]        
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
PROVISION FOR INCOME TAXES (11) (11) (18) (21)
Net income $ 18 $ 18 $ 42 $ 34