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Income Taxes - Schedule of Significant Components of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
May 31, 2018
May 31, 2017
Components Of Deferred Tax Assets And Liabilities [Abstract]    
Property, equipment, leases and intangibles $ 752 $ 124
Employee benefits 595 1,951
Self-insurance accruals 494 745
Other 416 692
Net operating loss/credit carryforwards 1,146 1,069
Valuation allowances (711) (738)
Deferred Tax Assets, Net 2,692 3,843
Property, equipment, leases and intangibles 3,663 4,993
Employee benefits 31  
Other 602 660
Deferred Tax Liabilities $ 4,296 $ 5,653