Annual report pursuant to Section 13 and 15(d)

Goodwill and Intangible Assets - Schedule Of Intangible Assets (Details)

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Goodwill and Intangible Assets - Schedule Of Intangible Assets (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]      
Intangible assets $ 2,870 $ 2,799  
Weighted average life in years 12 years 11 years 10 months 24 days  
Total accumulated amortization $ (807) $ (560)  
Intangible assets, net 2,063 2,239  
Amortization expense 258 211 $ 156
Purchased contract rights      
Finite-Lived Intangible Assets [Line Items]      
Intangible assets $ 1,214 $ 1,173  
Weighted average life in years 12 years 9 months 18 days 12 years 7 months 6 days  
Total accumulated amortization $ (375) $ (283)  
Provider contracts      
Finite-Lived Intangible Assets [Line Items]      
Intangible assets $ 299 $ 311  
Weighted average life in years 12 years 4 months 24 days 12 years 3 months 18 days  
Total accumulated amortization $ (115) $ (90)  
Customer relationships      
Finite-Lived Intangible Assets [Line Items]      
Intangible assets $ 812 $ 769  
Weighted average life in years 10 years 9 months 18 days 10 years 10 months 24 days  
Total accumulated amortization $ (122) $ (57)  
Trade names      
Finite-Lived Intangible Assets [Line Items]      
Intangible assets $ 361 $ 361  
Weighted average life in years 15 years 2 months 12 days 15 years 2 months 12 days  
Total accumulated amortization $ (80) $ (55)  
Developed technologies      
Finite-Lived Intangible Assets [Line Items]      
Intangible assets $ 179 $ 180  
Weighted average life in years 5 years 2 months 12 days 5 years 2 months 12 days  
Total accumulated amortization $ (111) $ (72)  
Other intangibles      
Finite-Lived Intangible Assets [Line Items]      
Intangible assets $ 5 $ 5  
Weighted average life in years 2 years 8 months 12 days 2 years 8 months 12 days  
Total accumulated amortization $ (4) $ (3)