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Reserve for Unpaid Losses and Loss Adjustment Expenses - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2017 | Dec. 31, 2019
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Unpaid losses and loss adjustment expenses | $ 41,243 | $ 39,659 |  |  |
Asbestos and Environmental |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Prior accident year development [1] |  |  | $ 218 |  |
Reinsurance, Excess Retention, Amount Reinsured, Per Policy | 256 |  |  |  |
Reinsurance, Amount Retained, Per Policy |  |  |  | $ 1,700 |
Reinsurance Policy, Type [Axis]: Asbestos and Environmental | Asbestos and Environmental |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Reinsurance, Amount Retained, Per Policy |  |  |  | $ 1,700 |
Retention Layer for Reserve for the Covered Liabilities as of the Inception Date [Member] | Reinsurance Policy, Type [Axis]: Adverse Development Cover Navigators Group |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Reinsurance, Amount Retained, Per Policy | 1,816 |  |  |  |
Retention Layer Above Reserve for the Covered Liabilities as of the Inception Date [Member] | Reinsurance Policy, Type [Axis]: Adverse Development Cover Navigators Group |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Reinsurance, Amount Retained, Per Policy | 100 |  |  |  |
Group Benefits |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Prior accident year development [1] | (381) | (458) | (445) |  |
Unpaid losses and loss adjustment expenses | 8,160 | 8,210 | 8,233 |  | $ 8,256
Group Benefits | Group long-term disability |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Prior accident year development [1] | 325 | 380 | 365 |  |
Unpaid losses and loss adjustment expenses | 6,766 |  |  |  |
Group Benefits | Group life and accident, excluding premium waiver |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Prior accident year development [1] | 50 | 65 | 65 |  |
Unpaid losses and loss adjustment expenses | 721 |  |  |  |
Group Benefits | Group supplemental health |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Prior accident year development [1] | 6 | $ 10 | 15 |  |
Unpaid losses and loss adjustment expenses | 42 |  |  |  |
Liability | Abuse Claims [Member] |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Prior accident year development [1] |  |  | $ 254 |  |
Unpaid losses and loss adjustment expenses | $ 787 |  |  |  |

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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 https://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 https://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount per policy of risk undertaken originally by insurer that is not ceded to reinsurer. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 50 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=99397103&loc=d3e6811-158387 + Details
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- Definition Amount per policy of risk ceded to reinsurer in excess of risk undertaken originally by insurer that is not ceded to reinsurer. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 50 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=99397103&loc=d3e6811-158387 + Details
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