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Reserve for Unpaid Losses and Loss Adjustment Expenses - P&C Liabilities for Unpaid Losses and Loss Adjustment Expense (Details) - USD ($) $ in Millions | 9 Months Ended | 28 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] |  |  |  |  |
Beginning liabilities for unpaid losses and loss adjustment expenses, gross | $ 37,855 |  |  |  |
Less: payments |  |  |  |  |
Ending liabilities for unpaid losses and loss adjustment expenses, gross | 39,378 |  | $ 39,378 |  |
Continental Europe Operations [Member] |  |  |  |  |
Less: payments |  |  |  |  |
Disposal Group, Including Discontinued Operation, Unpaid losses and loss adjustment expenses | 82 |  | 82 | $ 84 |
Adverse Development Cover Navigators Group [Member] |  |  |  |  |
Provision for unpaid losses and loss adjustment expense |  |  |  |  |
Prior accident year development [1] |  |  | 382 |  |
Deferred Revenue | 73 | $ 97 |  |  |
Property, Liability and Casualty Insurance Product Line |  |  |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] |  |  |  |  |
Beginning liabilities for unpaid losses and loss adjustment expenses, gross | 29,622 | 28,261 |  |  |
Reinsurance and other recoverables | 5,931 | 5,421 | 5,931 | 5,725 | $ 5,275
Beginning liabilities for unpaid losses and loss adjustment expenses, net | 25,259 | 23,730 | 25,259 | $ 23,897 | $ 22,986
Provision for unpaid losses and loss adjustment expense |  |  |  |  |
Current accident year | 5,968 | 5,992 |  |  |
Prior accident year development [1] | 170 | (320) |  |  |
Total provision for unpaid losses and loss adjustment expenses | 6,138 | 5,672 |  |  |
Less: payments |  |  |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year | (1,549) | (1,447) |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years | (3,155) | (3,338) |  |  |
Total payments | (4,704) | (4,785) |  |  |
Foreign currency adjustment | 1 | (3) |  |  |
Ending liabilities for unpaid losses and loss adjustment expenses, net | 25,259 | 23,730 | 25,259 |  |
Ending liabilities for unpaid losses and loss adjustment expenses, gross | 31,190 | 29,151 | 31,190 |  |
Property, Liability and Casualty Insurance Product Line | Continental Europe Operations [Member] |  |  |  |  |
Less: payments |  |  |  |  |
Disposal Group, Including Discontinued Operation, Unpaid losses and loss adjustment expenses | 0 | (43) | $ 0 |  |
Property, Liability and Casualty Insurance Product Line | Adverse Development Cover Navigators Group [Member] |  |  |  |  |
Provision for unpaid losses and loss adjustment expense |  |  |  |  |
Deferred Revenue | $ 73 | $ 97 |  |  |

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