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Health Care Costs Payable - Components of Change in Health Care Costs Payable (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] |  |  |
Health care costs payable, beginning of period | $ 10,142 |  |
Acquisition, net | 1,098 |  |
Add: Components of incurred health care costs |  |  |
Current year | 86,639 |  |
Prior years | (685) |  |
Total incurred health care costs | 85,954 |  |
Less: Claims paid |  |  |
Current year | 75,529 |  |
Prior years | 9,585 |  |
Total claims paid | 85,114 |  |
Add: Premium deficiency reserve | 0 | $ 0 |
Health care costs payable, end of period, net | 12,067 |  |
Add: Reinsurance recoverables | 5 |  |
Add: Impact of discount rate on long-duration insurance reserves | (23) |  |
Health care costs payable, end of period | 12,049 |  |
Health care costs payable, end of period |  | 10,142 |
Premium deficiency reserve | 0 | 0 |
Health Care Benefits |  |  |
Less: Claims paid |  |  |
Benefit costs recorded in other insurance liabilities | 83 | 79 | $ 58
Corporate/ Other |  |  |
Less: Claims paid |  |  |
Benefit costs recorded in other insurance liabilities | 210 | 249 | 271
Health Insurance Product Line |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] |  |  |
Health care costs payable, beginning of period | 10,142 |  |
Health care costs payable, beginning of period | 10,142 | 8,678 | 7,936
Less: Reinsurance recoverables | 5 | 8 | 10
Less: Impact of discount rate on long-duration insurance reserves | 8 | 0 | 0
Health care costs payable, beginning of period, net | 10,129 | 8,670 | 7,926
Acquisition, net |  | 0 | 0
Add: Components of incurred health care costs |  |  |
Current year |  | 71,399 | 64,631
Prior years |  | (654) | (788)
Total incurred health care costs |  | 70,745 | 63,843
Less: Claims paid |  |  |
Current year |  | 61,640 | 56,323
Prior years |  | 7,646 | 6,792
Total claims paid |  | 69,286 | 63,115
Add: Premium deficiency reserve |  | 0 | 16
Health care costs payable, end of period, net |  | 10,129 | 8,670
Add: Reinsurance recoverables | $ 5 | 5 | 8
Add: Impact of discount rate on long-duration insurance reserves |  | 8 | 0
Health care costs payable, end of period |  | 10,142 |
Health care costs payable, end of period |  | 10,142 | 8,678
Premium deficiency reserve |  | $ 0 | $ 16

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- Definition Amount, before tax, of accumulated other comprehensive income (loss) (AOCI) from (increase) decrease in expected future policy benefit component of liability for future policy benefit from change in discount rate. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29E -Publisher FASB -URI https://asc.fasb.org//1943274/2147480046/944-40-55-29E Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 65 -Paragraph 2 -Subparagraph (g)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480016/944-40-65-2 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 13I -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480046/944-40-55-13I Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-6 + 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 -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (cc) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-3 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-3 + Details
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