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Goodwill (Narratives) (Details) - USD ($)
$ in Millions
12 Months Ended
Aug. 31, 2018
Dec. 31, 2018
Goodwill    
Goodwill distributed through sale of businesses   $ 81
Disposal Group, Disposed of by Sale, Not Discontinued Operations | North America    
Goodwill    
Loss on sale of asset $ 54  
Goodwill distributed through sale of businesses $ 43