Quarterly report pursuant to Section 13 or 15(d)

Acquisitions - Narrative (Details)

v3.20.2
Acquisitions - Narrative (Details)
$ / shares in Units, shares in Millions, $ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Jan. 23, 2020
USD ($)
$ / shares
shares
Jan. 31, 2020
USD ($)
shares
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Business Acquisition [Line Items]            
Centene stock price (in usd per share) | $ / shares $ 66.76          
Acquisition related costs     $ 71   $ 384  
Gain on divestiture         104 $ 0
Centene Illinois Medicaid and Medicare Advantage Health Plans            
Business Acquisition [Line Items]            
Gain on divestiture     $ 11   104  
WellCare Health Plans, Inc.            
Business Acquisition [Line Items]            
Transaction value $ 19,555          
Consideration transferred 17,605          
Consideration transferred, shares valued 11,431 $ 11,431        
Cash paid 6,079          
Consideration transferred related to fair value of replacement equity awards associated with pre-combination service $ 95          
Common stock cancelled and converted into right to Centene common stock 3.38          
Cash paid per acquiree share, without interest (in usd per share) | $ / shares $ 120.00          
Shares issued (in shares) | shares 171 171        
Pro forma revenue (unaudited)       $ 25,325 $ 55,527 $ 50,494
Intangible assets $ 7,000