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Goodwill and Other Intangibles (Other Intangible Narrative) (Details) - USD ($)
3 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Goodwill [Line Items]        
Goodwill, impairment loss   $ 0 $ 579,000,000 $ 0
Impairment of intangible assets (excluding goodwill)   0 168,000,000 0
Intangible amortization   69,000,000 75,000,000 $ 79,000,000
EMEA        
Goodwill [Line Items]        
Goodwill, impairment loss $ 579,000,000 $ 579,000,000 579,000,000  
Impairment of intangible assets (excluding goodwill) $ 168,000,000   $ 168,000,000