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Reserve for Unpaid Losses and Loss Adjustment Expenses - Reconciliation of Loss Development to Liability for Unpaid Losses and Loss Adjustment Expenses, Group (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |
Unpaid losses and loss adjustment expenses | $ 41,243 | $ 39,659 |  |
Group Benefits |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 20,590 |  |  |
Cumulative Paid for Accident Years Displayed in Triangles | (14,088) |  |  |
Unpaid for Accident Years not Displayed in Triangles | 2,399 |  |  |
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance | 219 |  |  |
Discount | (1,205) | (1,304) | $ (1,353) |
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance | 7,915 | 7,965 | 7,996 | $ 8,009
Reinsurance and Other Recoverables | (245) | (245) | (237) | (247)
Unpaid losses and loss adjustment expenses | 8,160 | $ 8,210 | $ 8,233 | $ 8,256
Group long-term disability | Group Benefits |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 14,081 |  |  |
Cumulative Paid for Accident Years Displayed in Triangles | (8,142) |  |  |
Unpaid for Accident Years not Displayed in Triangles | 1,510 |  |  |
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance | 193 |  |  |
Discount | (1,107) |  |  |
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance | 6,535 |  |  |
Reinsurance and Other Recoverables | (231) |  |  |
Unpaid losses and loss adjustment expenses | 6,766 |  |  |
Group life and accident, excluding premium waiver | Group Benefits |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 6,509 |  |  |
Cumulative Paid for Accident Years Displayed in Triangles | (5,946) |  |  |
Unpaid for Accident Years not Displayed in Triangles | 161 |  |  |
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance | 5 |  |  |
Discount | (15) |  |  |
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance | 714 |  |  |
Reinsurance and Other Recoverables | (7) |  |  |
Unpaid losses and loss adjustment expenses | 721 |  |  |
Group short-term disability | Group Benefits |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |
Unpaid for Accident Years not Displayed in Triangles | 126 |  |  |
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance | 8 |  |  |
Discount | 0 |  |  |
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance | 134 |  |  |
Reinsurance and Other Recoverables | 0 |  |  |
Unpaid losses and loss adjustment expenses | 134 |  |  |
Group life premium waiver | Group Benefits |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |
Unpaid for Accident Years not Displayed in Triangles | 565 |  |  |
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance | 13 |  |  |
Discount | (83) |  |  |
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance | 495 |  |  |
Reinsurance and Other Recoverables | (2) |  |  |
Unpaid losses and loss adjustment expenses | 497 |  |  |
Group supplemental health | Group Benefits |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |
Unpaid for Accident Years not Displayed in Triangles | 37 |  |  |
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance | 0 |  |  |
Discount |  |  |  |
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance | 37 |  |  |
Reinsurance and Other Recoverables | (5) |  |  |
Unpaid losses and loss adjustment expenses | $ 42 |  |  |

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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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