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Goodwill and Other Intangibles (Other Intangibles Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]      
Intangible amortization $ 71 $ 74 $ 33