Statutory Requirements - Statutory Capital and Surplus and Net Income (Loss) (Details) $ in Millions	12 Months Ended
Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
ALRe
Statutory Accounting Practices [Line Items]
EBS capital & surplus	$ 14,474	$ 13,084
Statutory net income (loss)	832	937
ALRe \| Bermuda Jurisdiction
Statutory Accounting Practices [Line Items]
EBS capital & surplus	$ 18,245	$ 16,759
BSCR ratio	2.33	2.56
Increase (decrease) to capital and surplus due to permitted practices	$ 3,031
Increase (decrease) to statutory net income due to permitted practices	(1,593)
Maximum distribution permitted to remit without the need for prior approval	7,023	$ 5,550
AARe
Statutory Accounting Practices [Line Items]
EBS capital & surplus	17,773	17,126
Statutory net income (loss)	408	1,329
AARe \| Bermuda Jurisdiction
Statutory Accounting Practices [Line Items]
EBS capital & surplus	$ 26,647	$ 21,876
BSCR ratio	2.91	2.78
Increase (decrease) to capital and surplus due to permitted practices	$ 8,619
Increase (decrease) to statutory net income due to permitted practices	(8,278)
Maximum distribution permitted to remit without the need for prior approval	8,012	$ 7,050
ACRA 1A
Statutory Accounting Practices [Line Items]
EBS capital & surplus	5,092	5,637
Statutory net income (loss)	297	(87)
ACRA 1A \| Bermuda Jurisdiction
Statutory Accounting Practices [Line Items]
EBS capital & surplus	$ 5,296	$ 5,993
BSCR ratio	2.19	2.62
Increase (decrease) to capital and surplus due to permitted practices	$ 4,105
Increase (decrease) to statutory net income due to permitted practices	(1,471)
Maximum distribution permitted to remit without the need for prior approval	1,614	$ 1,912
ACRA 2A
Statutory Accounting Practices [Line Items]
EBS capital & surplus	1,952	198
Statutory net income (loss)	(759)	(2)
ACRA 2A \| Bermuda Jurisdiction
Statutory Accounting Practices [Line Items]
EBS capital & surplus	$ 3,717	198
BSCR ratio	3.53
Increase (decrease) to capital and surplus due to permitted practices	$ (938)
Increase (decrease) to statutory net income due to permitted practices	(930)
Maximum distribution permitted to remit without the need for prior approval	30	0
AADE
Statutory Accounting Practices [Line Items]
EBS capital & surplus	3,144	2,298
Statutory net income (loss)	0	(20)
AAIA
Statutory Accounting Practices [Line Items]
EBS capital & surplus	2,876	2,067
Statutory net income (loss)	(209)	(238)
AANY
Statutory Accounting Practices [Line Items]
EBS capital & surplus	290	284
Statutory net income (loss)	$ (3)	$ (23)

Statutory Accounting Practices, Capital And Surplus, Change In Permitted Practice, Amount

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Statutory Accounting Practices, Net Income, Permitted Practice, Amount

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Statutory Accounting Practices, Solvency Capital Ratio

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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.

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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

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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.

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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

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-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

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Amount of net income for the period determined using accounting principles prescribed or permitted by insurance regulators.

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