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Retirement Plans (Details 3) - USD ($)
$ in Millions
6 Months Ended
Dec. 15, 2016
Nov. 30, 2016
Nov. 30, 2015
Pension Plan Contributions [Line Items]      
Defined Benefit Plan Contributions By Employer   $ 500 $ 330
Required U.S. Pension Plan Contribution [Member]      
Pension Plan Contributions [Line Items]      
Defined Benefit Plan Contributions By Employer   250 8
Voluntary U.S. Pension Plan Contribution [Member]      
Pension Plan Contributions [Line Items]      
Defined Benefit Plan Contributions By Employer   $ 250 $ 322
December 2016 contribution      
Pension Plan Contributions [Line Items]      
Defined Benefit Plan Contributions By Employer $ 250    
December 2016 contribution required [Member]      
Pension Plan Contributions [Line Items]      
Defined Benefit Plan Contributions By Employer $ 178