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Income Taxes (Detail) - USD ($)
$ in Millions
9 Months Ended
Feb. 28, 2019
Feb. 28, 2018
May 31, 2018
Income Tax Disclosure [Abstract]      
Effective tax rate on continuing operations (percent) 14.60% 74.40%  
Total gross unrecognized tax benefits, excluding related interest and penalties $ 798   $ 698
Increase (decrease) in liability for payment of interest and penalties 12    
Total gross unrecognized tax benefits, excluding related interest and penalties, amount which would affect the Company's effective tax rate if recognized in future periods 537    
Accrued interest and penalties related to uncertain tax positions (excluding federal benefit) 169   $ 157
Estimated decrease in total gross unrecognized tax benefits as a result of resolutions of global tax examinations and expiration of applicable statutes of limitations $ 210