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Goodwill and Other Intangibles (Narrative) (Details) - EMEA - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2018
Goodwill [Line Items]    
Goodwill, impairment loss $ 579 $ 579
Impairment of intangible assets (excluding goodwill) $ 168