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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] |  |  |
Medical claims and benefits payable, beginning balance | $ 1,854 | $ 1,961 | $ 2,192
Components of medical care costs related to: |  |  |
Current year | 15,939 | 14,176 | 15,478
Prior periods | (119) | (271) | (341)
Total medical care costs | 15,820 | 13,905 | 15,137
Payments for medical care costs related to: |  |  |
Current year | 13,871 | 12,554 | 13,671
Prior years | 1,507 | 1,482 | 1,710
Total paid | 15,378 | 14,036 | 15,381
Acquisition - Magellan Complete Care | 294 | 0 | 0
Change in non-risk and other provider payables | 106 | 24 | 13
Medical claims and benefits payable, ending balance | $ 2,696 | $ 1,854 | 1,961
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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- Definition Amount of increase (decrease) in the cost of settling unpaid claims after deduction of reinsurance recoveries related to the acquisition of a business. Includes, but is not limited to, claims which have been incurred but not reported. + References No definition available. + Details
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