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Goodwill and Other Intangible Assets (Summary of Intangible Assets) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Goodwill and Other Intangible Assets      
Accumulated Amortization $ (539)   $ (503)
Intangible Assets Gross, Carrying Amount 1,842   1,671
Intangible Assets, Net Intangibles 1,303   1,168
Amortization 38 $ 31  
Customer and distributor relationships      
Goodwill and Other Intangible Assets      
Carrying Amount 991   906
Accumulated Amortization (261)   (241)
Net Intangibles 730   665
Proprietary technology and patents      
Goodwill and Other Intangible Assets      
Carrying Amount 201   163
Accumulated Amortization (81)   (75)
Net Intangibles 120   88
Trademarks      
Goodwill and Other Intangible Assets      
Carrying Amount 154   138
Accumulated Amortization (34)   (37)
Net Intangibles 120   101
Software      
Goodwill and Other Intangible Assets      
Carrying Amount 306   277
Accumulated Amortization (142)   (130)
Net Intangibles 164   147
Other      
Goodwill and Other Intangible Assets      
Carrying Amount 28   26
Accumulated Amortization (21)   (20)
Net Intangibles 7   6
Indefinite-lived intangibles      
Goodwill and Other Intangible Assets      
Accumulated Amortization 0   0
Indefinite-lived intangibles $ 162   $ 161