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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
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Insurance Claims |  |
Medical claims and benefits payable, beginning balance | $ 2,696 | $ 1,854
Components of medical care costs related to: |  |
Current year | 5,668 | 3,817
Prior years | (194) | (101)
Total medical care costs | 5,474 | 3,716
Payments for medical care costs related to: |  |
Current year | 3,513 | 2,274
Prior years | 1,781 | 1,305
Total paid | 5,294 | 3,579
Change in acquired balances | (25) |
Change in non-risk and other provider payables | (12) | (10)
Medical claims and benefits payable, ending balance | 2,839 | 1,981
Medicaid |  |
Insurance Claims |  |
Medical claims and benefits payable, beginning balance | 2,129 | 1,465
Components of medical care costs related to: |  |
Current year | 4,394 | 2,991
Prior years | (158) | (70)
Total medical care costs | 4,236 | 2,921
Payments for medical care costs related to: |  |
Current year | 2,790 | 1,786
Prior years | 1,364 | 1,014
Total paid | 4,154 | 2,800
Change in acquired balances | 8 |
Change in non-risk and other provider payables | (11) | (10)
Medical claims and benefits payable, ending balance | 2,208 | 1,576
Medicare |  |
Insurance Claims |  |
Medical claims and benefits payable, beginning balance | 392 | 267
Components of medical care costs related to: |  |
Current year | 738 | 543
Prior years | (16) | (26)
Total medical care costs | 722 | 517
Payments for medical care costs related to: |  |
Current year | 410 | 324
Prior years | 304 | 205
Total paid | 714 | 529
Change in acquired balances | (33) |
Change in non-risk and other provider payables | (1) | 0
Medical claims and benefits payable, ending balance | 366 | 255
Marketplace |  |
Insurance Claims |  |
Medical claims and benefits payable, beginning balance | 175 | 122
Components of medical care costs related to: |  |
Current year | 536 | 283
Prior years | (20) | (5)
Total medical care costs | 516 | 278
Payments for medical care costs related to: |  |
Current year | 313 | 164
Prior years | 113 | 86
Total paid | 426 | 250
Change in acquired balances | 0 |
Change in non-risk and other provider payables | 0 | 0
Medical claims and benefits payable, ending balance | $ 265 | $ 150

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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=116884095&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=116884095&loc=d3e14764-158437 + Details
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