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Medical Claims and Benefits Payable - Components of Change in Medical Claims and Benefits Payable (Details) - USD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020
Insurance Claims |  |
Medical claims and benefits payable, beginning balance | $ 2,696 | $ 1,854
Components of medical care costs related to: |  |
Current year | 11,486 | 7,372
Prior years | (193) | (58)
Total medical care costs | 11,293 | 7,314
Payments for medical care costs related to: |  |
Current year | 9,023 | 5,688
Prior years | 1,949 | 1,486
Total paid | 10,972 | 7,174
Change in acquired balances | (26) |
Change in non-risk and other provider payables | (49) | (34)
Medical claims and benefits payable, ending balance | 2,942 | 1,960
Medicaid |  |
Insurance Claims |  |
Medical claims and benefits payable, beginning balance | 2,129 | 1,465
Components of medical care costs related to: |  |
Current year | 8,869 | 5,777
Prior years | (150) | (34)
Total medical care costs | 8,719 | 5,743
Payments for medical care costs related to: |  |
Current year | 7,043 | 4,493
Prior years | 1,491 | 1,161
Total paid | 8,534 | 5,654
Change in acquired balances | (19) |
Change in non-risk and other provider payables | (48) | (34)
Medical claims and benefits payable, ending balance | 2,247 | 1,520
Medicare |  |
Insurance Claims |  |
Medical claims and benefits payable, beginning balance | 392 | 267
Components of medical care costs related to: |  |
Current year | 1,459 | 1,044
Prior years | (24) | (22)
Total medical care costs | 1,435 | 1,022
Payments for medical care costs related to: |  |
Current year | 1,111 | 783
Prior years | 330 | 228
Total paid | 1,441 | 1,011
Change in acquired balances | (7) |
Change in non-risk and other provider payables | (1) | 0
Medical claims and benefits payable, ending balance | 378 | 278
Marketplace |  |
Insurance Claims |  |
Medical claims and benefits payable, beginning balance | 175 | 122
Components of medical care costs related to: |  |
Current year | 1,158 | 551
Prior years | (19) | (2)
Total medical care costs | 1,139 | 549
Payments for medical care costs related to: |  |
Current year | 869 | 412
Prior years | 128 | 97
Total paid | 997 | 509
Change in acquired balances | 0 |
Change in non-risk and other provider payables | 0 | 0
Medical claims and benefits payable, ending balance | $ 317 | $ 162

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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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