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v3.20.4

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, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |
Unpaid losses and loss adjustment expenses | $ 37,855 | $ 36,517 |  |
Adverse Development Cover Navigators Group [Member] |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |
Deferred Revenue | 118 |  |  |
Group Benefits |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 20,299 |  |  |
Cumulative Paid for Accident Years Displayed in Triangles | (13,703) |  |  |
Unpaid for Accident Years not Displayed in Triangles | 2,553 |  |  |
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance | 200 |  |  |
Discount | (1,353) | (1,401) | $ (1,505) |
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance | 7,996 | 8,009 | 8,206 | $ 8,303
Reinsurance and Other Recoverables | (237) | (247) | (239) | (209)
Unpaid losses and loss adjustment expenses | 8,233 | $ 8,256 | $ 8,445 | $ 8,512
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 | 14,411 |  |  |
Cumulative Paid for Accident Years Displayed in Triangles | (8,420) |  |  |
Unpaid for Accident Years not Displayed in Triangles | 1,554 |  |  |
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance | 182 |  |  |
Discount | (1,233) |  |  |
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance | 6,494 |  |  |
Reinsurance and Other Recoverables | (227) |  |  |
Unpaid losses and loss adjustment expenses | 6,721 |  |  |
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 | 5,888 |  |  |
Cumulative Paid for Accident Years Displayed in Triangles | (5,283) |  |  |
Unpaid for Accident Years not Displayed in Triangles | 163 |  |  |
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance | 4 |  |  |
Discount | (17) |  |  |
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance | 755 |  |  |
Reinsurance and Other Recoverables | (3) |  |  |
Unpaid losses and loss adjustment expenses | 758 |  |  |
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 | 117 |  |  |
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance | 4 |  |  |
Discount | 0 |  |  |
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance | 121 |  |  |
Reinsurance and Other Recoverables | 0 |  |  |
Unpaid losses and loss adjustment expenses | 121 |  |  |
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 | 688 |  |  |
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance | 10 |  |  |
Discount | (103) |  |  |
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance | 595 |  |  |
Reinsurance and Other Recoverables | (2) |  |  |
Unpaid losses and loss adjustment expenses | 597 |  |  |
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 | 31 |  |  |
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance | 0 |  |  |
Discount | 0 |  |  |
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance | 31 |  |  |
Reinsurance and Other Recoverables | (5) |  |  |
Unpaid losses and loss adjustment expenses | $ 36 |  |  |

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