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Commitments (Details)
$ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
employee
Dec. 31, 2016
USD ($)
Mar. 24, 2016
USD ($)
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]        
Rent expense $ 207 $ 171 $ 137  
2019 174      
2020 176      
2021 145      
2022 101      
2023 71      
Thereafter 200      
Annual non-cancelable minimum lease payments, Total $ 867      
Long term investment, California Organized Investment Network        
Other Commitments [Line Items]        
Commitment to undertaking       $ 30
Commitment to undertaking, term 5 years      
Long term investment, service center in California        
Other Commitments [Line Items]        
Commitment to undertaking       200
Commitment to undertaking, term   10 years    
Commitment to undertaking, expensed $ 8      
Long term investment, service center in California | Minimum        
Other Commitments [Line Items]        
Commitment to undertaking, by employing (people) (at least) | employee   300    
Long term investment, improve enrollee health outcomes        
Other Commitments [Line Items]        
Commitment to undertaking       10
Long term investment, support locally based consumer assistance programs        
Other Commitments [Line Items]        
Commitment to undertaking       5
Commitment to undertaking, term   5 years    
Long term investment,improvement in enrollee health, locally based consumer assistance, and health care delivery system        
Other Commitments [Line Items]        
Commitment to undertaking       65
Long term investment,improvement in enrollee health, locally based consumer assistance, and health care delivery system | Selling, General and Administrative Expenses        
Other Commitments [Line Items]        
Commitment to undertaking, expensed 13      
Long term investment, strengthen the healthcare delivery system        
Other Commitments [Line Items]        
Commitment to undertaking       50
Commitment to undertaking, term   5 years    
Long term investment, vehicles supporting California’s health care infrastructure        
Other Commitments [Line Items]        
Commitment to undertaking       $ 75
Commitment to undertaking, expensed $ 12