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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, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | ---
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |
Unpaid losses and loss adjustment expenses | $ 44,610 | $ 42,318 |  |
Group Benefits |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 20,578 |  |  |
Cumulative Paid for Accident Years Displayed in Triangles | (13,912) |  |  |
Unpaid for Accident Years not Displayed in Triangles | 2,237 |  |  |
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance | 217 |  |  |
Discount | (1,196) | (1,166) | $ (1,205) |
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance | 7,924 | 8,020 | 7,915 | $ 7,965
Reinsurance and Other Recoverables | (282) | (254) | (245) | (245)
Unpaid losses and loss adjustment expenses | 8,206 | $ 8,274 | $ 8,160 | $ 8,210
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 | 14,365 |  |  |
Cumulative Paid for Accident Years Displayed in Triangles | (8,243) |  |  |
Unpaid for Accident Years not Displayed in Triangles | 1,400 |  |  |
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance | 193 |  |  |
Discount | (1,121) |  |  |
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance | 6,594 |  |  |
Reinsurance and Other Recoverables | (270) |  |  |
Unpaid losses and loss adjustment expenses | 6,864 |  |  |
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 | 6,213 |  |  |
Cumulative Paid for Accident Years Displayed in Triangles | (5,669) |  |  |
Unpaid for Accident Years not Displayed in Triangles | 145 |  |  |
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance | 5 |  |  |
Discount | (12) |  |  |
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance | 682 |  |  |
Reinsurance and Other Recoverables | (4) |  |  |
Unpaid losses and loss adjustment expenses | 686 |  |  |
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 | 173 |  |  |
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance | 10 |  |  |
Discount | 0 |  |  |
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance | 183 |  |  |
Reinsurance and Other Recoverables | 0 |  |  |
Unpaid losses and loss adjustment expenses | 183 |  |  |
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 | 485 |  |  |
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance | 9 |  |  |
Discount | (63) |  |  |
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance | 431 |  |  |
Reinsurance and Other Recoverables | (3) |  |  |
Unpaid losses and loss adjustment expenses | 434 |  |  |
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 | 34 |  |  |
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance | 0 |  |  |
Discount | 0 |  |  |
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance | 34 |  |  |
Reinsurance and Other Recoverables | (5) |  |  |
Unpaid losses and loss adjustment expenses | $ 39 |  |  |

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