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Goodwill and Intangible Assets - Schedule of Intangible Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]    
Intangible assets $ 9,835 $ 10,036
Total accumulated amortization (2,924) (2,212)
Intangible assets, net $ 6,911 $ 7,824
Weighted average life in years 13 years 4 months 24 days 13 years 2 months 12 days
Purchased contract rights and customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets $ 7,850 $ 8,068
Total accumulated amortization $ (2,193) $ (1,642)
Weighted average life in years 13 years 4 months 24 days 13 years 6 months
Trade names    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets $ 983 $ 1,107
Total accumulated amortization $ (263) $ (206)
Weighted average life in years 15 years 4 months 24 days 13 years 3 months 18 days
Provider contracts    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets $ 612 $ 492
Total accumulated amortization $ (183) $ (139)
Weighted average life in years 14 years 13 years 9 months 18 days
Developed technologies    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets $ 390 $ 369
Total accumulated amortization $ (285) $ (225)
Weighted average life in years 5 years 3 months 18 days 5 years 4 months 24 days