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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |
Unpaid losses and loss adjustment expenses | $ 36,517 | $ 33,029 |  |
Group Benefits |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 18,950 |  |  |
Cumulative Paid for Accident Years Displayed in Triangles | (12,648) |  |  |
Unpaid for Accident Years not Displayed in Triangles | 2,918 |  |  |
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance | 190 |  |  |
Discount | (1,401) | (1,505) | $ (1,536) |
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance | 8,009 | 8,206 | 8,303 | $ 5,564
Reinsurance and Other Recoverables | (247) | (239) | (209) | (208)
Unpaid losses and loss adjustment expenses | 8,256 | $ 8,445 | $ 8,512 | $ 5,772
Group Benefits | Group long-term disability |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 13,157 |  |  |
Cumulative Paid for Accident Years Displayed in Triangles | (7,316) |  |  |
Unpaid for Accident Years not Displayed in Triangles | 1,874 |  |  |
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance | 173 |  |  |
Discount | (1,272) |  |  |
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance | 6,616 |  |  |
Reinsurance and Other Recoverables | (236) |  |  |
Unpaid losses and loss adjustment expenses | 6,852 |  |  |
Group Benefits | Group life and accident, excluding premium waiver |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 5,793 |  |  |
Cumulative Paid for Accident Years Displayed in Triangles | (5,332) |  |  |
Unpaid for Accident Years not Displayed in Triangles | 134 |  |  |
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance | 3 |  |  |
Discount | (18) |  |  |
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance | 580 |  |  |
Reinsurance and Other Recoverables | (1) |  |  |
Unpaid losses and loss adjustment expenses | 581 |  |  |
Group Benefits | Group short-term disability |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |
Unpaid for Accident Years not Displayed in Triangles | 114 |  |  |
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance | 4 |  |  |
Discount | 0 |  |  |
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance | 118 |  |  |
Reinsurance and Other Recoverables | 0 |  |  |
Unpaid losses and loss adjustment expenses | 118 |  |  |
Group Benefits | Group life premium waiver |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |
Unpaid for Accident Years not Displayed in Triangles | 758 |  |  |
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance | 10 |  |  |
Discount | (111) |  |  |
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance | 657 |  |  |
Reinsurance and Other Recoverables | (2) |  |  |
Unpaid losses and loss adjustment expenses | 659 |  |  |
Group Benefits | Group supplemental health |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |
Unpaid for Accident Years not Displayed in Triangles | 38 |  |  |
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance | 0 |  |  |
Discount | 0 |  |  |
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance | 38 |  |  |
Reinsurance and Other Recoverables | (8) |  |  |
Unpaid losses and loss adjustment expenses | $ 46 |  |  |

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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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