Goodwill and Other Intangible Assets (Summary of Other Intangible Assets) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Goodwill and Other Intangible Assets
Accumulated Amortization	$ (383)	$ (331)
Indefinite-lived intangibles	154	132
Intangible Assets Gross, Carrying Amount	1,584	766
Intangible Assets, Net Intangibles	1,201	435
Customer and Distributor Relationships
Goodwill and Other Intangible Assets
Carrying Amount	891	320
Accumulated Amortization	(168)	(140)
Net Intangibles	$ 723	180
Finite-Lived Intangible Asset, Useful Life	14 years
Proprietary Technology
Goodwill and Other Intangible Assets
Carrying Amount	$ 156	116
Accumulated Amortization	(61)	(54)
Net Intangibles	$ 95	62
Finite-Lived Intangible Asset, Useful Life	16 years
Trademarks
Goodwill and Other Intangible Assets
Carrying Amount	$ 139	35
Accumulated Amortization	(23)	(19)
Net Intangibles	$ 116	16
Finite-Lived Intangible Asset, Useful Life	12 years
Internally Developed Network Software
Goodwill and Other Intangible Assets
Carrying Amount	$ 218	155
Accumulated Amortization	(118)	(110)
Net Intangibles	$ 100	45
Finite-Lived Intangible Asset, Useful Life	5 years
Other
Goodwill and Other Intangible Assets
Carrying Amount	$ 26	8
Accumulated Amortization	(13)	(8)
Net Intangibles	$ 13	$ 0
Finite-Lived Intangible Asset, Useful Life	5 years