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Goodwill and Other Intangible Assets (Other Intangible Assets) (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Amortized intangible assets:    
Other intangible assets, gross $ 1,204 $ 1,121
Other intangible assets, accumulated amortization 362 325
Other intangible assets, net 842 796
Patents, Trademarks, and Trade Names [Member]    
Amortized intangible assets:    
Other intangible assets, gross 366 360
Other intangible assets, accumulated amortization 186 176
Other intangible assets, net 180 184
Customer Lists and Other [Member]    
Amortized intangible assets:    
Other intangible assets, gross 838 761
Other intangible assets, accumulated amortization 176 149
Other intangible assets, net $ 662 $ 612