Goodwill and Other Intangible Assets (Summary of Other Intangible Assets) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Goodwill and Other Intangible Assets
Accumulated Amortization	$ (887)	$ (737)
Indefinite-lived intangibles	169	166
Intangible Assets Gross, Carrying Amount	1,980	1,911
Intangible Assets, Net Intangibles	1,093	1,174
Customer and Distributor Relationships
Goodwill and Other Intangible Assets
Carrying Amount	941	945
Accumulated Amortization	(410)	(352)
Net Intangibles	$ 531	593
Finite-Lived Intangible Asset, Useful Life	14 years
Proprietary Technology
Goodwill and Other Intangible Assets
Carrying Amount	$ 206	204
Accumulated Amortization	(131)	(111)
Net Intangibles	$ 75	93
Finite-Lived Intangible Asset, Useful Life	14 years
Trademarks
Goodwill and Other Intangible Assets
Carrying Amount	$ 143	148
Accumulated Amortization	(63)	(52)
Net Intangibles	$ 80	96
Finite-Lived Intangible Asset, Useful Life	13 years
Internally Developed Network Software
Goodwill and Other Intangible Assets
Carrying Amount	$ 500	428
Accumulated Amortization	(265)	(206)
Net Intangibles	$ 235	222
Finite-Lived Intangible Asset, Useful Life	5 years
Other
Goodwill and Other Intangible Assets
Carrying Amount	$ 21	20
Accumulated Amortization	(18)	(16)
Net Intangibles	$ 3	$ 4
Finite-Lived Intangible Asset, Useful Life	4 years