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Medical Claims and Benefits Payable - Components of Change in Medical Claims and Benefits Payable (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Insurance Claims |  |
Medical claims and benefits payable, beginning balance | $ 2,192 | $ 1,929
Components of medical care costs related to: |  |
Current period | 3,963 | 4,253
Prior periods | (241) | (142)
Total medical care costs | 3,722 | 4,111
Change in non-risk provider payables | 45 | (96)
Payments for medical care costs related to: |  |
Current period | 2,498 | 2,683
Prior periods | 1,438 | 1,335
Total paid | 3,936 | 4,018
Medical claims and benefits payable, ending balance | $ 2,023 | $ 1,926
Benefit from prior period as a percentage of: |  |
Balance at beginning of period | 11.00% | 7.40%
Premium revenue, trailing twelve months | 1.30% | 0.80%
Medical care costs, trailing twelve months | 1.40% | 0.90%

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- Definition The amount needed to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65670824&loc=d3e14764-158437 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (cc) -URI http://asc.fasb.org/extlink&oid=65670824&loc=d3e14764-158437 + Details
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