Fair Value Measurements - Gains or Losses Recorded Related to Fair Value Option (Details) - Fair Value Option - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Fair Value, Option, Quantitative Disclosures
Fair value option gain (loss)	$ 715	$ 266	$ (136)
Other bond securities
Fair Value, Option, Quantitative Disclosures
Fair value option gain (loss)	19	46	(374)
Alternative investments
Fair Value, Option, Quantitative Disclosures
Fair value option gain (loss)	257	220	32
Retained investment in Corebridge
Fair Value, Option, Quantitative Disclosures
Fair value option gain (loss)	$ 439	$ 0	$ 0

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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 30
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-30

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 31
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-31

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 32
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-32

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