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Statutory Information - Summary of statutory capital, surplus and net income (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Bermuda |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |
Actual statutory capital and surplus | [1] | $ 24,120 | $ 19,546 |
Required statutory capital and surplus | [1] | 7,112 | 6,450 |
Statutory net income (loss) |  | 3,519 | 1,730 | $ 2,371
Ireland |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |
Actual statutory capital and surplus | [1] | 1,148 | 968 |
Required statutory capital and surplus | [1] | 942 | 815 |
Statutory net income (loss) |  | 53 | (53) | 25
United States |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |
Actual statutory capital and surplus | [1] | 6,897 | 6,195 |
Required statutory capital and surplus | [1] | 1,895 | 1,749 |
Statutory net income (loss) |  | 592 | 220 | 346
United Kingdom |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |
Actual statutory capital and surplus | [1] | 1,367 | 1,018 |
Required statutory capital and surplus | [1] | 1,192 | 543 |
Statutory net income (loss) |  | 72 | 57 | 35
Canada |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |
Actual statutory capital and surplus | [1] | 83 | 69 |
Required statutory capital and surplus | [1] | 53 | 48 |
Statutory net income (loss) |  | 6 | 9 | 7
Australia |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |
Actual statutory capital and surplus | [1] | 366 | 285 |
Required statutory capital and surplus | [1] | 179 | 176 |
Statutory net income (loss) |  | $ 68 | $ 39 | $ 12
[1] | Such amounts include ownership interests in affiliated insurance and reinsurance subsidiaries.

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(23)(c)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 + Details
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- Definition The amount of statutory capital and surplus (stockholders' equity) as of the balance sheet date using prescribed or permitted statutory accounting practices (rather than GAAP, if different) of the state or country. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(23)(c)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 944 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479989/944-505-50-1 + Details
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- Definition Amount of statutory capital required to be maintained as of the balance sheet date under prescribed or permitted statutory accounting practices. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 944 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479989/944-505-50-1 + Details
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- Definition Amount of net income for the period determined using accounting principles prescribed or permitted by insurance regulators. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(23)(c)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 + Details
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