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Reserve for Unpaid Losses and Loss Adjustment Expenses - P&C Liabilities for Unpaid Losses and Loss Adjustment Expenses (Details) - USD ($) $ in Millions | 3 Months Ended | 7 Months Ended | 12 Months Ended | 19 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2020 | Dec. 31, 2018 | Dec. 31, 2017
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] |  |  |  |  |  |  |  |
Beginning liabilities for unpaid losses and loss adjustment expenses, gross |  |  | $ 36,517 |  |  |  |  |
Payments |  |  |  |  |  |  |  |
Ending liabilities for unpaid losses and loss adjustment expenses, gross |  | $ 36,517 | 37,855 | $ 36,517 |  | $ 37,855 |  |
Adverse Development Cover Navigators Group [Member] |  |  |  |  |  |  |  |
Provision for unpaid losses and loss adjustment expenses |  |  |  |  |  |  |  |
Increase (Decrease) in Deferred Revenue |  |  | (102) | (16) |  |  |  |
Property and Casualty Insurance Subsidiaries |  |  |  |  |  |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] |  |  |  |  |  |  |  |
Beginning liabilities for unpaid losses and loss adjustment expenses, gross |  |  | 28,261 | 24,584 | $ 23,775 |  |  |
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments |  | 5,275 |  |  |  | 5,725 | $ 4,232 | $ 3,957
Beginning liabilities for unpaid losses and loss adjustment expenses, net |  |  | 22,986 | 20,352 | 19,818 |  |  |
Provision for unpaid losses and loss adjustment expenses |  |  |  |  |  |  |  |
Current accident year |  |  | 7,794 | 7,463 | 7,107 |  |  |
Prior accident year development [1] |  |  | (136) | (65) | (167) |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims |  |  | 7,658 | 7,398 | 6,940 |  |  |
Payments |  |  |  |  |  |  |  |
Current accident year |  |  | (2,214) | (2,374) | (2,452) |  |  |
Prior accident years |  |  | (4,190) | (4,374) | (3,954) |  |  |
Total payments |  |  | (6,404) | (6,748) | (6,406) |  |  |
Foreign currency adjustment |  |  | 14 | (1) | 0 |  |  |
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance |  | 22,986 | 22,986 | 20,352 | 19,818 | 23,897 | 20,352 | $ 19,818
Ending liabilities for unpaid losses and loss adjustment expenses, gross |  | 28,261 | 29,622 | 28,261 | 24,584 | 29,622 |  |
Property and Casualty Insurance Subsidiaries | Continental Europe Operations [Member] |  |  |  |  |  |  |  |
Payments |  |  |  |  |  |  |  |
Net reserves transferred to liabilities held for sale |  | 0 |  |  |  | (45) | 0 |
Property and Casualty Insurance Subsidiaries | Adverse Development Cover Navigators Group [Member] |  |  |  |  |  |  |  |
Provision for unpaid losses and loss adjustment expenses |  |  |  |  |  |  |  |
Increase (Decrease) in Deferred Revenue |  |  | (312) | (16) | $ 0 |  |  |
The Navigators Group, Inc. [Member] | Adverse Development Cover Navigators Group [Member] |  |  |  |  |  |  |  |
Provision for unpaid losses and loss adjustment expenses |  |  |  |  |  |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims | $ 97 | 97 |  | $ 84 |  |  |  |
Increase (Decrease) in Deferred Revenue |  | (16) | $ (102) |  |  | (118) |  |
Payments |  |  |  |  |  |  |  |
Current accident year | $ (29) |  |  |  |  |  |  |
The Navigators Group, Inc. [Member] | Property and Casualty Insurance Subsidiaries |  |  |  |  |  |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Reserves net Reinsurance and Other Recoverables |  | $ 2,001 |  |  |  | $ 0 | $ 0 |

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