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Significant Accounting Policies - Narrative (Details)
person in Millions, $ in Millions
3 Months Ended
Mar. 31, 2020
USD ($)
person
building
clinic
patient
Segment
state
Mar. 31, 2019
USD ($)
Jan. 01, 2020
USD ($)
Dec. 31, 2019
USD ($)
Significant Accounting Policies [Line Items]        
Number of pharmacy plan members | person 102      
Number of patients served per year | patient 1,000,000      
Number of reportable segments | Segment 4      
Allowance for credit losses $ 340     $ 319
Health insurer fee 271      
Related party transaction, expenses from transactions with related party 20 $ 10    
Related party transaction, other revenues from transactions with related party $ 21 $ 25    
Heartland Healthcare Services        
Significant Accounting Policies [Line Items]        
Number of states in which entity operates | state 4      
Retail/ LTC        
Significant Accounting Policies [Line Items]        
Number of stores | building 9,900      
Number of walk in medical clinics | clinic 1,100      
Health Care Benefits        
Significant Accounting Policies [Line Items]        
Number of people served through health insurance products and related services | person 34      
Accounting Standards Update 2016-13        
Significant Accounting Policies [Line Items]        
Adjustment to retained earnings     $ (3)  
Accounting Standards Update 2016-13 | Retained Earnings        
Significant Accounting Policies [Line Items]        
Adjustment to retained earnings     $ (3)