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Statutory Requirements - Statutory Capital and Surplus and Net Income (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
ALRe | Bermuda
Statutory Accounting Practices [Line Items]
Statutory Accounting Practices, Statutory Capital and Surplus, Balance	$ 13,084	$ 11,823
Statutory Accounting Practices, Statutory Net Income Amount	937	3,278	$ 1,544
AARe | Bermuda
Statutory Accounting Practices [Line Items]
Statutory Accounting Practices, Statutory Capital and Surplus, Balance	17,126	2,649
Statutory Accounting Practices, Statutory Net Income Amount	1,329	(3,703)	92
ACRA | Bermuda
Statutory Accounting Practices [Line Items]
Statutory Accounting Practices, Statutory Capital and Surplus, Balance	5,637	4,187
Statutory Accounting Practices, Statutory Net Income Amount	(87)	293	1,522
AADE | Delaware
Statutory Accounting Practices [Line Items]
Statutory Accounting Practices, Statutory Capital and Surplus, Balance	2,298	1,605
Statutory Accounting Practices, Statutory Net Income Amount	(20)	(70)	54
AANY | New York
Statutory Accounting Practices [Line Items]
Statutory Accounting Practices, Statutory Capital and Surplus, Balance	284	304
Statutory Accounting Practices, Statutory Net Income Amount	(23)	(8)	(25)
AAIA | Iowa
Statutory Accounting Practices [Line Items]
Statutory Accounting Practices, Statutory Capital and Surplus, Balance	2,067	1,279
Statutory Accounting Practices, Statutory Net Income Amount	$ (238)	$ (182)	$ (8)

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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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(23)(c))
-URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 505
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=6486098&loc=d3e24708-158529

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
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