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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, P&C (Details) - USD ($) $ in Millions | 12 Months Ended | 60 Months Ended |
--- | --- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2021 | Dec. 31, 2018
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |
Unpaid losses and loss adjustment expenses | $ 39,659 | $ 37,855 |  | $ 39,659 |
Asbestos and Environmental |  |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |
Unpaid for Accident Years not Displayed in Triangles | 604 |  |  | 604 |
Policyholder Benefits and Claims Incurred, Ceded |  | 220 |  | 1,015 |
Adverse Development Cover Navigators Group [Member] |  |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |
Policyholder Benefits and Claims Incurred, Ceded | 300 |  |  |  |
Deferred Revenue | 209 |  |  | 209 |
Segment Reconciling Items | Asbestos and Environmental |  |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |
Unpaid for Accident Years not Displayed in Triangles | 724 |  |  | 724 |
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance | 0 |  |  | 0 |
Amount of discount | 0 |  |  | 0 |
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance | 724 |  |  | 724 |
Reinsurance and Other Recoverables | 1,545 |  |  | 1,545 |
Unpaid losses and loss adjustment expenses | 2,269 |  |  | 2,269 |
Workers’ compensation | Segment Reconciling Items |  |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 18,263 |  |  | 18,263 |
Cumulative Paid for Accident Years Displayed in Triangles | (9,992) |  |  | (9,992) |
Unpaid for Accident Years not Displayed in Triangles | 2,981 |  |  | 2,981 |
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance | 348 |  |  | 348 |
Amount of discount | 341 |  |  | 341 |
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance | 11,259 |  |  | 11,259 |
Reinsurance and Other Recoverables | 1,793 |  |  | 1,793 |
Unpaid losses and loss adjustment expenses | 13,052 |  |  | 13,052 |
General liability | Adverse Development Cover Navigators Group [Member] |  |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |
Policyholder Benefits and Claims Incurred, Ceded | 86 |  |  |  |
General liability | Segment Reconciling Items |  |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 6,731 |  |  | 6,731 |
Cumulative Paid for Accident Years Displayed in Triangles | (3,157) |  |  | (3,157) |
Unpaid for Accident Years not Displayed in Triangles | 1,240 |  |  | 1,240 |
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance | 146 |  |  | 146 |
Amount of discount | 0 |  |  | 0 |
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance | 4,960 |  |  | 4,960 |
Reinsurance and Other Recoverables | 870 |  |  | 870 |
Unpaid losses and loss adjustment expenses | 5,830 |  |  | 5,830 |
Marine [Member] | Adverse Development Cover Navigators Group [Member] |  |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |
Policyholder Benefits and Claims Incurred, Ceded | 39 |  |  |  |
Marine [Member] | Segment Reconciling Items |  |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 1,516 |  |  | 1,516 |
Cumulative Paid for Accident Years Displayed in Triangles | (1,242) |  |  | (1,242) |
Unpaid for Accident Years not Displayed in Triangles | 17 |  |  | 17 |
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance | 12 |  |  | 12 |
Amount of discount | 0 |  |  | 0 |
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance | 303 |  |  | 303 |
Reinsurance and Other Recoverables | 235 |  |  | 235 |
Unpaid losses and loss adjustment expenses | 538 |  |  | 538 |
Package business | Segment Reconciling Items |  |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 6,952 |  |  | 6,952 |
Cumulative Paid for Accident Years Displayed in Triangles | (5,208) |  |  | (5,208) |
Unpaid for Accident Years not Displayed in Triangles | 77 |  |  | 77 |
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance | 103 |  |  | 103 |
Amount of discount | 0 |  |  | 0 |
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance | 1,924 |  |  | 1,924 |
Reinsurance and Other Recoverables | 90 |  |  | 90 |
Unpaid losses and loss adjustment expenses | 2,014 |  |  | 2,014 |
Property | P&C Commercial Lines | Adverse Development Cover Navigators Group [Member] |  |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |
Policyholder Benefits and Claims Incurred, Ceded | 3 |  |  |  |
Property | P&C Commercial Lines | Segment Reconciling Items |  |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 3,830 |  |  | 3,830 |
Cumulative Paid for Accident Years Displayed in Triangles | (3,342) |  |  | (3,342) |
Unpaid for Accident Years not Displayed in Triangles | 24 |  |  | 24 |
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance | 18 |  |  | 18 |
Amount of discount | 0 |  |  | 0 |
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance | 530 |  |  | 530 |
Reinsurance and Other Recoverables | 268 |  |  | 268 |
Unpaid losses and loss adjustment expenses | 798 |  |  | 798 |
Automobile liability | P&C Commercial Lines | Adverse Development Cover Navigators Group [Member] |  |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |
Policyholder Benefits and Claims Incurred, Ceded | 16 |  |  |  |
Automobile liability | P&C Commercial Lines | Segment Reconciling Items |  |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 3,908 |  |  | 3,908 |
Cumulative Paid for Accident Years Displayed in Triangles | (2,778) |  |  | (2,778) |
Unpaid for Accident Years not Displayed in Triangles | 22 |  |  | 22 |
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance | 23 |  |  | 23 |
Amount of discount | 0 |  |  | 0 |
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance | 1,175 |  |  | 1,175 |
Reinsurance and Other Recoverables | 91 |  |  | 91 |
Unpaid losses and loss adjustment expenses | 1,266 |  |  | 1,266 |
Automobile liability | P&C Personal Lines | Segment Reconciling Items |  |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 11,104 |  |  | 11,104 |
Cumulative Paid for Accident Years Displayed in Triangles | (9,809) |  |  | (9,809) |
Unpaid for Accident Years not Displayed in Triangles | 29 |  |  | 29 |
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance | 66 |  |  | 66 |
Amount of discount | 0 |  |  | 0 |
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance | 1,390 |  |  | 1,390 |
Reinsurance and Other Recoverables | 23 |  |  | 23 |
Unpaid losses and loss adjustment expenses | 1,413 |  |  | 1,413 |
Commercial automobile physical damage | P&C Commercial Lines | Segment Reconciling Items |  |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 172 |  |  | 172 |
Cumulative Paid for Accident Years Displayed in Triangles | (162) |  |  | (162) |
Unpaid for Accident Years not Displayed in Triangles | 4 |  |  | 4 |
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance | 0 |  |  | 0 |
Amount of discount | 0 |  |  | 0 |
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance | 14 |  |  | 14 |
Reinsurance and Other Recoverables | (1) |  |  | (1) |
Unpaid losses and loss adjustment expenses | 13 |  |  | 13 |
Professional liability | Adverse Development Cover Navigators Group [Member] |  |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |
Policyholder Benefits and Claims Incurred, Ceded | 110 |  |  |  |
Professional liability | Segment Reconciling Items |  |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 2,511 |  |  | 2,511 |
Cumulative Paid for Accident Years Displayed in Triangles | (1,335) |  |  | (1,335) |
Unpaid for Accident Years not Displayed in Triangles | 47 |  |  | 47 |
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance | 38 |  |  | 38 |
Amount of discount | 0 |  |  | 0 |
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance | 1,261 |  |  | 1,261 |
Reinsurance and Other Recoverables | 781 |  |  | 781 |
Unpaid losses and loss adjustment expenses | 2,042 |  |  | 2,042 |
Bond | Segment Reconciling Items |  |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 625 |  |  | 625 |
Cumulative Paid for Accident Years Displayed in Triangles | (254) |  |  | (254) |
Unpaid for Accident Years not Displayed in Triangles | 32 |  |  | 32 |
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance | 31 |  |  | 31 |
Amount of discount | 0 |  |  | 0 |
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance | 434 |  |  | 434 |
Reinsurance and Other Recoverables | 10 |  |  | 10 |
Unpaid losses and loss adjustment expenses | 444 |  |  | 444 |
Assumed Reinsurance [Member] | Adverse Development Cover Navigators Group [Member] |  |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |
Policyholder Benefits and Claims Incurred, Ceded | 29 |  |  |  |
Assumed Reinsurance [Member] | Segment Reconciling Items |  |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 1,384 |  |  | 1,384 |
Cumulative Paid for Accident Years Displayed in Triangles | (1,106) |  |  | (1,106) |
Unpaid for Accident Years not Displayed in Triangles | 3 |  |  | 3 |
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance | 4 |  |  | 4 |
Amount of discount | 0 |  |  | 0 |
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance | 285 |  |  | 285 |
Reinsurance and Other Recoverables | 50 |  |  | 50 |
Unpaid losses and loss adjustment expenses | 335 |  |  | 335 |
Personal automobile physical damage | Segment Reconciling Items |  |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 1,200 |  |  | 1,200 |
Cumulative Paid for Accident Years Displayed in Triangles | (1,170) |  |  | (1,170) |
Unpaid for Accident Years not Displayed in Triangles | 7 |  |  | 7 |
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance | 3 |  |  | 3 |
Amount of discount | 0 |  |  | 0 |
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance | 40 |  |  | 40 |
Reinsurance and Other Recoverables | 0 |  |  | 0 |
Unpaid losses and loss adjustment expenses | 40 |  |  | 40 |
Homeowners | Segment Reconciling Items |  |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 6,307 |  |  | 6,307 |
Cumulative Paid for Accident Years Displayed in Triangles | (5,982) |  |  | (5,982) |
Unpaid for Accident Years not Displayed in Triangles | 5 |  |  | 5 |
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance | 34 |  |  | 34 |
Amount of discount | 0 |  |  | 0 |
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance | 364 |  |  | 364 |
Reinsurance and Other Recoverables | 17 |  |  | 17 |
Unpaid losses and loss adjustment expenses | 381 |  |  | 381 |
Homeowners | P&C Personal Lines | Segment Reconciling Items |  |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |
Cumulative Paid for Accident Years Displayed in Triangles | (5,982) |  |  | (5,982) |
Other ongoing business | Adverse Development Cover Navigators Group [Member] |  |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |
Policyholder Benefits and Claims Incurred, Ceded | 17 |  |  |  |
Other ongoing business | Segment Reconciling Items |  |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |
Unpaid for Accident Years not Displayed in Triangles | 183 |  |  | 183 |
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance | 5 |  |  | 5 |
Amount of discount | 14 |  |  | 14 |
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance | 174 |  |  | 174 |
Reinsurance and Other Recoverables | 310 |  |  | 310 |
Unpaid losses and loss adjustment expenses | 484 |  |  | 484 |
Other operations | Segment Reconciling Items |  |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |
Unpaid for Accident Years not Displayed in Triangles | 374 |  |  | 374 |
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance | 157 |  |  | 157 |
Amount of discount | 0 |  |  | 0 |
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance | 531 |  |  | 531 |
Reinsurance and Other Recoverables | (1) |  |  | (1) |
Unpaid losses and loss adjustment expenses | 530 |  |  | 530 |
Property and Casualty Insurance Products |  |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 64,503 |  |  | 64,503 |
Cumulative Paid for Accident Years Displayed in Triangles | (45,537) |  |  | (45,537) |
Unpaid for Accident Years not Displayed in Triangles | 5,769 |  |  | 5,769 |
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance | 988 |  |  | 988 |
Amount of discount | 355 | 367 | $ 388 | 355 |
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance | 25,368 | 23,897 | 22,986 | 25,368 | $ 20,352
Reinsurance and Other Recoverables | 6,081 | 5,725 | 5,275 | 6,081 | 4,232
Unpaid losses and loss adjustment expenses | 31,449 | 29,622 | 28,261 | $ 31,449 | $ 24,584
Policyholder Benefits and Claims Incurred, Ceded | $ 1,243 | $ 1,156 | $ 826 |  |

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