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Basis of Presentation (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
member
State
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
member
State
Segment
Jun. 30, 2017
USD ($)
Basis Of Presentation [Line Items]        
Number of reportable segments (in segment) | Segment     3  
Health Plans        
Basis Of Presentation [Line Items]        
Number of states in which entity operates (in state) | State 13   13  
Number of members eligible for the health care programs, approximately (in member) | member 4,100,000   4,100,000  
Minimum contract terms     3 years  
Maximum contract terms     5 years  
Puerto Rico        
Basis Of Presentation [Line Items]        
Number of members served, approximately (in member) | member 326,000   326,000  
Florida        
Basis Of Presentation [Line Items]        
Number of members served, approximately (in member) | member 96,000   96,000  
Washington        
Basis Of Presentation [Line Items]        
Number of members served, approximately (in member) | member 742,000   742,000  
Health Care, Premium        
Basis Of Presentation [Line Items]        
Revenue | $ $ 4,514 $ 4,740 $ 8,837 $ 9,388
Health Care, Premium | Puerto Rico | Health Plans        
Basis Of Presentation [Line Items]        
Revenue | $     370  
Health Care, Premium | Florida | Health Plans        
Basis Of Presentation [Line Items]        
Revenue | $     232  
Health Care, Premium | Washington | Health Plans        
Basis Of Presentation [Line Items]        
Revenue | $     $ 1,083