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Receivables | 12 Months Ended
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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 |

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