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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, 2022 | Dec. 31, 2021
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Claims Development [Line Items] |  |
Incurred Health Care Claims, Net of Reinsurance | $ 131,444 |
Cumulative Paid Health Care Claims, Net of Reinsurance | 121,714 |
All outstanding liabilities for health care costs payable prior to 2021, net of reinsurance | 196 |
Total outstanding liabilities for health care costs payable, net of reinsurance | 9,926 |
2021 |  |
Claims Development [Line Items] |  |
Incurred Health Care Claims, Net of Reinsurance | 62,259 | $ 62,830
Cumulative Paid Health Care Claims, Net of Reinsurance | 62,144 | $ 54,600
2022 |  |
Claims Development [Line Items] |  |
Incurred Health Care Claims, Net of Reinsurance | 69,185 |
Cumulative Paid Health Care Claims, Net of Reinsurance | $ 59,570 |

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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 https://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 https://asc.fasb.org/extlink&oid=116884468&loc=SL65671311-158438 + Details
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