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Goodwill and Intangible Assets - Schedule Of Intangible Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]      
Intangible assets $ 2,799 $ 1,747  
Weighted average life in years 11 years 10 months 15 days 11 years 7 months 6 days  
Total accumulated amortization $ (560) $ (349)  
Intangible assets, net 2,239 1,398  
Amortization expense 211 156 $ 147
Purchased contract rights      
Finite-Lived Intangible Assets [Line Items]      
Intangible assets $ 1,173 $ 1,173  
Weighted average life in years 12 years 7 months 6 days 12 years 7 months 6 days  
Total accumulated amortization $ (283) $ (188)  
Provider contracts      
Finite-Lived Intangible Assets [Line Items]      
Intangible assets $ 311 $ 274  
Weighted average life in years 12 years 3 months 11 years 10 months 24 days  
Total accumulated amortization $ (90) $ (66)  
Customer relationships      
Finite-Lived Intangible Assets [Line Items]      
Intangible assets $ 769 $ 22  
Weighted average life in years 10 years 10 months 15 days 8 years 2 months 12 days  
Total accumulated amortization $ (57) $ (21)  
Trade names      
Finite-Lived Intangible Assets [Line Items]      
Intangible assets $ 361 $ 162  
Weighted average life in years 15 years 2 months 9 years 7 months 6 days  
Total accumulated amortization $ (55) $ (34)  
Developed technologies      
Finite-Lived Intangible Assets [Line Items]      
Intangible assets $ 180 $ 109  
Weighted average life in years 5 years 2 months 5 years  
Total accumulated amortization $ (72) $ (40)  
Other Intangibles      
Finite-Lived Intangible Assets [Line Items]      
Intangible assets $ 5 $ 7  
Weighted average life in years 2 years 7 months 30 days 2 years 9 months 10 days  
Total accumulated amortization $ (3) $ 0