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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 | 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 | $ 36,517 | $ 33,029 |
Workers’ compensation |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 18,990 |  |
Cumulative Paid for Accident Years Displayed in Triangles | (10,991) |  |
Unpaid for Accident Years not Displayed in Triangles | 2,446 |  |
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance | 345 |  |
Discount | (372) |  |
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance | 10,418 |  |
Reinsurance and Other Recoverables | (2,093) |  |
Unpaid losses and loss adjustment expenses | 12,511 |  |
General liability |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 5,711 |  |
Cumulative Paid for Accident Years Displayed in Triangles | (2,828) |  |
Unpaid for Accident Years not Displayed in Triangles | 471 |  |
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance | 140 |  |
Discount | 0 |  |
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance | 3,494 |  |
Reinsurance and Other Recoverables | (630) |  |
Unpaid losses and loss adjustment expenses | 4,124 |  |
Marine [Member] |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 1,226 |  |
Cumulative Paid for Accident Years Displayed in Triangles | (974) |  |
Unpaid for Accident Years not Displayed in Triangles | 19 |  |
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance | 8 |  |
Discount | 0 |  |
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance | 279 |  |
Reinsurance and Other Recoverables | (135) |  |
Unpaid losses and loss adjustment expenses | 414 |  |
Package business |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 6,817 |  |
Cumulative Paid for Accident Years Displayed in Triangles | (5,215) |  |
Unpaid for Accident Years not Displayed in Triangles | 49 |  |
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance | 91 |  |
Discount | 0 |  |
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance | 1,742 |  |
Reinsurance and Other Recoverables | (33) |  |
Unpaid losses and loss adjustment expenses | 1,775 |  |
Property | Property and Casualty, Commercial Insurance [Member] |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 2,939 |  |
Cumulative Paid for Accident Years Displayed in Triangles | (2,520) |  |
Unpaid for Accident Years not Displayed in Triangles | 29 |  |
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance | 13 |  |
Discount | 0 |  |
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance | 461 |  |
Reinsurance and Other Recoverables | (162) |  |
Unpaid losses and loss adjustment expenses | 623 |  |
Automobile liability | Property and Casualty, Commercial Insurance [Member] |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 3,698 |  |
Cumulative Paid for Accident Years Displayed in Triangles | (2,739) |  |
Unpaid for Accident Years not Displayed in Triangles | 11 |  |
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance | 22 |  |
Discount | 0 |  |
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance | 992 |  |
Reinsurance and Other Recoverables | (73) |  |
Unpaid losses and loss adjustment expenses | 1,065 |  |
Automobile liability | Property and Casualty, Personal Insurance [Member] |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 11,985 |  |
Cumulative Paid for Accident Years Displayed in Triangles | (10,518) |  |
Unpaid for Accident Years not Displayed in Triangles | 25 |  |
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance | 68 |  |
Discount | 0 |  |
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance | 1,560 |  |
Reinsurance and Other Recoverables | (27) |  |
Unpaid losses and loss adjustment expenses | 1,587 |  |
Commercial automobile physical damage |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 206 |  |
Cumulative Paid for Accident Years Displayed in Triangles | (194) |  |
Unpaid for Accident Years not Displayed in Triangles | 3 |  |
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance | 0 |  |
Discount | 0 |  |
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance | 15 |  |
Reinsurance and Other Recoverables | 1 |  |
Unpaid losses and loss adjustment expenses | 14 |  |
Professional liability |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 1,796 |  |
Cumulative Paid for Accident Years Displayed in Triangles | (863) |  |
Unpaid for Accident Years not Displayed in Triangles | 86 |  |
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance | 31 |  |
Discount | 0 |  |
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance | 1,050 |  |
Reinsurance and Other Recoverables | (549) |  |
Unpaid losses and loss adjustment expenses | 1,599 |  |
Bond |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 637 |  |
Cumulative Paid for Accident Years Displayed in Triangles | (353) |  |
Unpaid for Accident Years not Displayed in Triangles | 29 |  |
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance | 24 |  |
Discount | 0 |  |
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance | 337 |  |
Reinsurance and Other Recoverables | (13) |  |
Unpaid losses and loss adjustment expenses | 350 |  |
Assumed Reinsurance [Member] |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 1,005 |  |
Cumulative Paid for Accident Years Displayed in Triangles | (824) |  |
Unpaid for Accident Years not Displayed in Triangles | 4 |  |
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance | 5 |  |
Discount | 0 |  |
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance | 190 |  |
Reinsurance and Other Recoverables | (25) |  |
Unpaid losses and loss adjustment expenses | 215 |  |
Personal automobile physical damage |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 1,531 |  |
Cumulative Paid for Accident Years Displayed in Triangles | (1,507) |  |
Unpaid for Accident Years not Displayed in Triangles | 6 |  |
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance | 3 |  |
Discount | 0 |  |
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance | 33 |  |
Reinsurance and Other Recoverables | 0 |  |
Unpaid losses and loss adjustment expenses | 33 |  |
Homeowners |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |
Cumulative Incurred for Accident Years Displayed in Triangles | 7,443 |  |
Cumulative Paid for Accident Years Displayed in Triangles | (6,958) |  |
Unpaid for Accident Years not Displayed in Triangles | 4 |  |
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance | 38 |  |
Discount | 0 |  |
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance | 527 |  |
Reinsurance and Other Recoverables | (41) |  |
Unpaid losses and loss adjustment expenses | 568 |  |
Other ongoing business |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |
Unpaid for Accident Years not Displayed in Triangles | 231 |  |
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance | 0 |  |
Discount | (16) |  |
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance | 215 |  |
Reinsurance and Other Recoverables | (312) |  |
Unpaid losses and loss adjustment expenses | 527 |  |
Asbestos and Environmental |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |
Unpaid for Accident Years not Displayed in Triangles | 1,147 |  |
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance | 0 |  |
Discount | 0 |  |
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance | 1,147 |  |
Reinsurance and Other Recoverables | (1,219) |  |
Unpaid losses and loss adjustment expenses | 2,366 |  |
Other operations |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |
Unpaid for Accident Years not Displayed in Triangles | 375 |  |
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance | 151 |  |
Discount | 0 |  |
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance | 526 |  |
Reinsurance and Other Recoverables | 36 |  |
Unpaid losses and loss adjustment expenses | 490 |  |
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 | 63,984 |  |
Cumulative Paid for Accident Years Displayed in Triangles | (46,484) |  |
Unpaid for Accident Years not Displayed in Triangles | 4,935 |  |
Unpaid Unallocated Loss Adjustment Expenses, Net of Reinsurance | 939 |  |
Discount | (388) | $ (388) | $ (410)
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance | 22,986 |  |
Reinsurance and Other Recoverables | (5,275) |  |
Unpaid losses and loss adjustment expenses | $ 28,261 |  |

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