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Goodwill and Other Intangible Assets (Summary of Other Intangible Assets) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Goodwill and Other Intangible Assets    
Accumulated Amortization $ (737) $ (603)
Indefinite-lived intangibles 166 159
Intangible Assets Gross, Carrying Amount 1,911 1,835
Intangible Assets, Net Intangibles 1,174 1,232
Customer and Distributor Relationships    
Goodwill and Other Intangible Assets    
Carrying Amount 945 951
Accumulated Amortization (352) (286)
Net Intangibles $ 593 665
Finite-Lived Intangible Asset, Useful Life 14 years  
Proprietary Technology    
Goodwill and Other Intangible Assets    
Carrying Amount $ 204 198
Accumulated Amortization (111) (93)
Net Intangibles $ 93 105
Finite-Lived Intangible Asset, Useful Life 14 years  
Trademarks    
Goodwill and Other Intangible Assets    
Carrying Amount $ 148 148
Accumulated Amortization (52) (41)
Net Intangibles $ 96 107
Finite-Lived Intangible Asset, Useful Life 13 years  
Internally Developed Network Software    
Goodwill and Other Intangible Assets    
Carrying Amount $ 428 355
Accumulated Amortization (206) (164)
Net Intangibles $ 222 191
Finite-Lived Intangible Asset, Useful Life 5 years  
Other    
Goodwill and Other Intangible Assets    
Carrying Amount $ 20 24
Accumulated Amortization (16) (19)
Net Intangibles $ 4 $ 5
Finite-Lived Intangible Asset, Useful Life 5 years