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Related party transaction (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Related Party Transaction [Line Items] |  |  |
Ceded Premiums Written | $ 8,912 | $ 7,441 | $ 7,849
Losses and loss expenses | 21,980 | 21,710 | 18,730
Insurance and reinsurance balances payable | $ 7,243 | $ 6,708 |
Bermuda | ABR Reinsurance Capital Holdings Ltd. [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Ownership Percentage | 17.10% | 16.00% |
Starr Technical Risk Agency and Affiliates [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Minimum Amount of Program Business to be Written to Earn Profit Sharing | $ 20 |  |
Premiums Written, Gross | 592 | $ 507 | 394
Ceded Premiums Written | 321 | 253 | 207
Paid commissions | 114 | 97 | 77
Commissions received | 73 | 59 | 46
Losses and loss expenses | 157 | 170 | 185
Reinsurance Recoverable on Losses and Loss Expenses | 516 | 432 |
Insurance and reinsurance balances payable | 88 | 80 |
ABR Reinsurance Capital Holdings Ltd. [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Ceded Premiums Written | 442 | 350 | 321
Commissions received | 133 | 100 | $ 92
Reinsurance Recoverable on Losses and Loss Expenses | 963 | 806 |
Insurance and reinsurance balances payable | $ 107 | $ 67 |
Warrants & Rights Outstanding | 0.50% |  |
BlackRock, Inc. |  |  |
Related Party Transaction [Line Items] |  |  |
Revenue from Related Parties | $ 11 |  |

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