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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, 2019 | Mar. 31, 2018
Insurance Claims |  |
Medical claims and benefits payable, beginning balance | $ 1,961 | $ 2,192
Components of medical care costs related to: |  |
Current period | 3,560 | 4,033
Prior periods | (189) | (311)
Total medical care costs | 3,371 | 3,722
Change in non-risk provider payables | 171 | 45
Payments for medical care costs related to: |  |
Current period | 2,197 | 2,498
Prior periods | 1,311 | 1,438
Total paid | 3,508 | 3,936
Medical claims and benefits payable, ending balance | $ 1,995 | 2,023
CMS Subsidies |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |
Operating expense |  | $ 70

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99382578&loc=d3e14764-158437 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (cc) -URI http://asc.fasb.org/extlink&oid=99382578&loc=d3e14764-158437 + Details
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