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Receivables (Tables)
12 Months Ended
Dec. 31, 2018
Receivables [Abstract]  
Summary of accounts receivable
 
December 31,
 
2018
 
2017
 
(In millions)
Premiums and other receivables
855

 
695

Pharmacy administrative services receivables
179

 

Pharmacy rebate receivables
155

 
154

Health insurer fee reimbursement receivables
141

 
22

 
$
1,330

 
$
871