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Receivables
12 Months Ended
Dec. 31, 2018
Receivables [Abstract]  
Receivables
Receivables
Receivables consist primarily of amounts due from government agencies, which may be subject to potential retroactive adjustments. Because all of our receivable amounts are readily determinable and substantially all of our creditors are governmental authorities, our allowance for doubtful accounts is insignificant. Any amounts determined to be uncollectible are charged to expense when such determination is made.
 
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