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Summary of Significant Accounting Policies (Details)
$ in Millions
Nov. 19, 2015
May 31, 2016
USD ($)
Dec. 23, 2015
Accounting Policies [Abstract]      
Stock split, conversion ratio 2    
Dividend payable as result of stock split (as a percent)     100.00%
Deferred income taxes and other assets | Accounting Standards Update 2015-03      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Debt issuance costs   $ (17)  
Long-term debt | Accounting Standards Update 2015-03      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Debt issuance costs   $ 17