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Acquisitions (Schedule of recognized identifiable assets acquired and liabilities assumed) (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jul. 01, 2023 | Dec. 31, 2022
--- | --- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |  |  |
Accrued investment income |  | $ 1,165 | $ 1,086 |  |  |
Insurance and reinsurance balances receivable |  | 15,709 | 13,379 |  |  |
Reinsurance recoverable on losses and loss expenses | [1] | 19,606 | 19,952 |  |  |
Reinsurance recoverable on policy benefits | [1] | 292 | 280 |  |  |
Value of business acquired |  | 3,452 | 3,674 |  |  |
Other assets |  | 8,461 | 7,508 |  |  |
Total assets |  | 250,557 | 230,682 |  |  |
Unpaid losses and loss expenses |  | 84,326 | 80,122 | $ 79,705 |  | $ 75,747
Unearned premiums |  | 24,498 | 22,051 |  |  |
Future policy benefits |  | 16,003 | 13,888 | 13,109 |  |
Policyholders' account balances |  | 8,136 | 7,462 | 7,178 |  |
Insurance and reinsurance balances payable |  | 8,696 | 8,302 |  |  |
Accounts Payable and Accrued Liabilities |  | 8,967 | 8,332 |  |  |
Deferred tax liabilities |  | 1,652 | 1,555 |  |  |
Repurchase agreements |  | 3,048 | 2,833 |  |  |
Total liabilities |  | 180,437 | 166,991 |  |  |
Stockholders' Equity |  | 65,757 | 59,507 | 52,373 |  |
Noncontrolling interests |  | 4,363 | 4,184 |  |  |
Total shareholders' equity |  | $ 70,120 | $ 63,691 | $ 57,504 |  |
Huatai Group |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Investments and Cash |  |  |  |  | $ 13,346 |
Accrued investment income |  |  |  |  | 60 |
Insurance and reinsurance balances receivable |  |  |  |  | 277 |
Reinsurance recoverable on losses and loss expenses |  |  |  |  | 581 |
Reinsurance recoverable on policy benefits |  |  |  |  | 27 |
Value of business acquired |  |  |  |  | 309 |
Goodwill and intangible assets |  |  |  |  | 5,113 |
Other assets |  |  |  |  | 748 |
Total assets |  |  |  |  | 20,461 |
Unpaid losses and loss expenses |  |  |  |  | 831 |
Unearned premiums |  |  |  |  | 800 |
Future policy benefits |  |  |  |  | 2,351 |
Policyholders' account balances |  |  |  |  | 4,014 |
Insurance and reinsurance balances payable |  |  |  |  | 644 |
Accounts Payable and Accrued Liabilities |  |  |  |  | 682 |
Deferred tax liabilities |  |  |  |  | 232 |
Repurchase agreements |  |  |  |  | 1,269 |
Total liabilities |  |  |  |  | 10,823 |
Stockholders' Equity |  |  |  |  | 4,428 |
Noncontrolling interests |  |  |  |  | 5,210 |
Total shareholders' equity |  |  |  |  | $ 9,638 |
[1] | Net of valuation allowance for uncollectible reinsurance.

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