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Medical Claims and Benefits Payable - Components of the Change (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] |  |  |
Medical claims and benefits payable, beginning balance | $ 1,961 | $ 2,192 | $ 1,929
Components of medical care costs related to: |  |  |
Current period | 14,176 | 15,478 | 17,037
Prior periods | (271) | (341) | 36
Total medical care costs | 13,905 | 15,137 | 17,073
Change in non-risk and other provider payables | 24 | 13 | (106)
Payments for medical care costs related to: |  |  |
Current period | 12,554 | 13,671 | 15,130
Prior periods | 1,482 | 1,710 | 1,574
Total paid | 14,036 | 15,381 | 16,704
Medical claims and benefits payable, ending balance | $ 1,854 | 1,961 | $ 2,192
CMS Subsidies |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |
Disposal group, operating expense |  | $ 81 |

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- Definition Amount of operating expense attributable to disposal group, including, but not limited to, discontinued operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721673-107760 + Details
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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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