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Basis of Presentation and Summary of Significant Accounting Policies (Narrative, Inventories) (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Jun. 30, 2017
Accounting Policies [Abstract]    
Portion of inventories held at LIFO, percentage 56.00% 56.00%
Inventories valued at LIFO amount higher than average cost value $ 92 $ 46
Reserves for excess and obsolete inventory $ 147 $ 76