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Health Care Costs Payable - Incurred and Paid Health Care Claims Development (Details) - Health Insurance Product Line - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Claims Development [Line Items] |  |
Incurred Health Care Claims,Net of Reinsurance | $ 105,585 |
Cumulative Paid Health Care Claims,Net of Reinsurance | 97,961 |
All outstanding liabilities for health care costs payable prior to 2019, net of reinsurance | 144 |
Total outstanding liabilities for health care costs payable, net of reinsurance | 7,768 |
2019 |  |
Claims Development [Line Items] |  |
Incurred Health Care Claims,Net of Reinsurance | 51,056 | $ 51,426
Cumulative Paid Health Care Claims,Net of Reinsurance | 50,394 | $ 44,987
2020 |  |
Claims Development [Line Items] |  |
Incurred Health Care Claims,Net of Reinsurance | 54,529 |
Cumulative Paid Health Care Claims,Net of Reinsurance | $ 47,567 |

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- Definition Amount, after reinsurance, of paid claims and allocated claim adjustment expense used in claims development for short-duration insurance contracts. Excludes unallocated claim adjustment expense. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 4B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=116884468&loc=SL65671311-158438 + Details
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- Definition Undiscounted amount, after reinsurance, of incurred claims and allocated claim adjustment expense used in claims development for short-duration insurance contracts. Excludes unallocated claim adjustment expense. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 4B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=116884468&loc=SL65671311-158438 + Details
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