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Medical Claims and Benefits Payable (Tables) | 12 Months Ended
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Dec. 31, 2017
Insurance [Abstract] |
Schedule of liability for unpaid claims and claims adjustment expense | The following table provides the details of our medical claims and benefits payable (including amounts payable for the provision of long-term services and supports, or LTSS) as of the dates indicated.
| December 31,
| 2017 |  | 2016 |  | 2015
| (In millions)
Fee-for-service claims incurred but not paid (IBNP) | $ | 1,717 |  |  | $ | 1,352 |  |  | $ | 1,191 |
Pharmacy payable | 112 |  |  | 112 |  |  | 88 |
Capitation payable | 67 |  |  | 37 |  |  | 140 |
Other | 296 |  |  | 428 |  |  | 266 |
| $ | 2,192 |  |  | $ | 1,929 |  |  | $ | 1,685 |
Components of the change in medical claims and benefits payable | The following table presents the components of the change in our medical claims and benefits payable for the periods indicated. The amounts presented for “Components of medical care costs related to: Prior periods” represent the amount by which our original estimate of medical claims and benefits payable at the beginning of the period were less (more) than the actual amount of the liability based on information (principally the payment of claims) developed since that liability was first reported.
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
| (In millions)
Medical claims and benefits payable, beginning balance | $ | 1,929 |  |  | $ | 1,685 |  |  | $ | 1,201 |
Components of medical care costs related to: |  |  |  |  |
Current period | 17,037 |  |  | 14,966 |  |  | 11,935 |
Prior periods | 36 |  |  | (192 | ) |  | (141 | )
Total medical care costs | 17,073 |  |  | 14,774 |  |  | 11,794 |
Change in non-risk provider payables | (106 | ) |  | 58 |  |  | 48 |
Payments for medical care costs related to: |  |  |  |  |
Current period | 15,130 |  |  | 13,304 |  |  | 10,448 |
Prior periods | 1,574 |  |  | 1,284 |  |  | 910 |
Total paid | 16,704 |  |  | 14,588 |  |  | 11,358 |
Medical claims and benefits payable, ending balance | $ | 2,192 |  |  | $ | 1,929 |  |  | $ | 1,685 |
Incurred and paid claims development |
Incurred Claims and Allocated Claims Adjustment Expenses |  | Total IBNP |  | Cumulative number of reported claims
Benefit Year |  | 2015 (1) |  | 2016 |  | 2017 |
|  | (In millions)
2015 |  | $ | 12,113 |  |  | $ | 11,928 |  |  | $ | 11,939 |  |  | $ | 6 |  |  | 84 |
2016 |  |  |  | 15,064 |  |  | 15,093 |  |  | 46 |  |  | 109 |
2017 |  |  |  |  |  | 17,037 |  |  | 1,665 |  |  | 114 |
|  |  |  |  |  | $ | 44,069 |  |  | $ | 1,717 |  |  |
Cumulative Paid Claims and Allocated Claims Adjustment Expenses |
Benefit Year |  | 2015 (1) |  | 2016 |  | 2017 |
|  | (In millions) |
2015 |  | $ | 10,615 |  |  | $ | 11,906 |  |  | $ | 11,932 |  |
2016 |  |  |  | 13,403 |  |  | 14,952 |  |
2017 |  |  |  |  |  | 15,130 |  |
|  |  |  |  |  | $ | 42,014 |  |
Reconciliation of claims development to liability | The following table represents a reconciliation of claims development to the aggregate carrying amount of the liability for medical claims and benefits payable.
|  |  |  |  |  | 2017 |
|  |  |  |  |  | (In millions) |
Incurred claims and allocated claims adjustment expenses |  | $ | 44,069 |  |
Less: cumulative paid clams and allocated claims adjustment expenses |  | (42,014 | ) |
Non-risk provider payables and other |  | 137 |  |
Medical claims and benefits payable |  | $ | 2,192 |  |
_______________________________
(1) | Data presented for this calendar year is required supplementary information, which is unaudited.

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- Definition Tabular disclosure of the activity in the reserve for settling insured claims and expenses incurred in the claims settlement process for the period. The estimated liability includes the amount of money that will be required for future payments of (a) claims that have been reported to the insurer, (b) claims related to insured events that have occurred but that have not been reported to the insurer as of the date the liability is estimated, and (c) claim adjustment expenses. Claim adjustment expenses include costs incurred in the claim settlement process such as legal fees; outside adjuster fees; and costs to record, process, and adjust claims. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=65670824&loc=d3e14764-158437 + Details
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- Definition Tabular disclosure of undiscounted information about claims development by accident year for short-duration insurance contracts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=65670685&loc=SL65671311-158438 + Details
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- Definition Tabular disclosure for the reconciliation of claims development to the liability for unpaid claims and claim adjustment expense for short-duration insurance contracts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=65670685&loc=SL65671315-158438 + Details
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