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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 | 6 Months Ended | 25 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 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 | 38,702 |  | $ 38,702 |  |
Adverse Development Cover Navigators Group [Member] |  |  |  |  |
Provision for unpaid losses and loss adjustment expense |  |  |  |  |
Prior accident year development [1] |  |  | 354 |  |
Deferred Revenue | 45 | $ 83 |  |  |
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 | 5,905 | 5,427 | 5,905 | $ 5,725 | $ 5,275
Beginning liabilities for unpaid losses and loss adjustment expenses, net | 24,677 | 23,257 | 24,677 | $ 23,897 | $ 22,986
Provision for unpaid losses and loss adjustment expense |  |  |  |  |
Current accident year | 3,838 | 3,962 |  |  |
Prior accident year development [1] | 80 | (245) |  |  |
Total provision for unpaid losses and loss adjustment expenses | 3,918 | 3,717 |  |  |
Less: payments |  |  |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year | (864) | (778) |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years | (2,222) | (2,575) |  |  |
Total payments | (3,086) | (3,353) |  |  |
Foreign currency adjustment | (7) | (10) |  |  |
Ending liabilities for unpaid losses and loss adjustment expenses, net | 24,677 | 23,257 | 24,677 |  |
Ending liabilities for unpaid losses and loss adjustment expenses, gross | 30,582 | 28,684 | $ 30,582 |  |
Property, Liability and Casualty Insurance Product Line | Adverse Development Cover Navigators Group [Member] |  |  |  |  |
Provision for unpaid losses and loss adjustment expense |  |  |  |  |
Deferred Revenue | $ 45 | $ 83 |  |  |

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