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Business Combinations - Summarizes the Preliminary Values of the Assets acquired and Liabilities Assumed at the Date of Acquisition (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Oct. 25, 2021
Dec. 31, 2020
Dec. 31, 2019
Assets acquired:        
Goodwill $ 982   $ 692 $ 143
Health Plans Segment        
Assets acquired:        
Current assets   $ 234    
Goodwill   280    
Intangible assets   69    
Other long-term assets   8    
Liabilities assumed:        
Medical claims and benefits payable   (224)    
Amounts due government agencies   (155)    
Accounts payable, accrued and other long-term liabilities   (36)    
Net consideration transferred   $ 176