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Reserve for Unpaid Losses and Loss Adjustment Expenses - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Unpaid losses and loss adjustment expenses | $ 39,659 | $ 37,855 |  |
Group Benefits |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Prior accident year development [1] | (458) | (445) | $ (410) |
Unpaid losses and loss adjustment expenses | 8,210 | 8,233 | 8,256 | $ 8,445
Group Benefits | Group long-term disability |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Prior accident year development [1] | 380 | 365 | 340 |
Unpaid losses and loss adjustment expenses | 6,671 |  |  |
Group Benefits | Group life and accident, excluding premium waiver |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Prior accident year development [1] | 65 | 65 | $ 60 |
Unpaid losses and loss adjustment expenses | 833 |  |  |
Group Benefits | Group supplemental health |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Prior accident year development [1] | 10 | 15 |  |
Unpaid losses and loss adjustment expenses | 39 |  |  |
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 http://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 http://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, after effects of reinsurance, of expense (reversal of expense) for claims incurred in prior reporting periods and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 + Details
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