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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, 2023 | Dec. 31, 2022
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Claims Development [Line Items] |  |
Incurred Health Care Claims, Net of Reinsurance | $ 150,902 |
Cumulative Paid Health Care Claims, Net of Reinsurance | 140,538 |
All outstanding liabilities for health care costs payable prior to 2022, net of reinsurance | 171 |
Total outstanding liabilities for health care costs payable, net of reinsurance | 10,535 |
2022 |  |
Claims Development [Line Items] |  |
Incurred Health Care Claims, Net of Reinsurance | 68,540 | $ 69,185
Cumulative Paid Health Care Claims, Net of Reinsurance | 68,363 | $ 59,570
2023 |  |
Claims Development [Line Items] |  |
Incurred Health Care Claims, Net of Reinsurance | 82,362 |
Cumulative Paid Health Care Claims, Net of Reinsurance | $ 72,175 |

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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 -Name Accounting Standards Codification -Section 50 -Paragraph 4B -Subparagraph (b) -SubTopic 40 -Topic 944 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-4B + Details
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