Derivatives and Hedge Accounting - Derivatives not Designated as Hedging Instruments (Details) - Derivatives not designated as hedging instruments - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2025	Mar. 31, 2024
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	$ (75)	$ (49)
Net realized gains (losses) - Excluding Fortitude Re Funds Withheld Assets
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	$ (28)	$ (42)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Realized Investment Gains (Losses)	Realized Investment Gains (Losses)
Net Realized Gains (Losses) On Fortitude Re funds Withheld Assets
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	$ (47)	$ (7)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Realized Investment Gains (Losses)	Realized Investment Gains (Losses)
Interest rate contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	$ (1)	$ (2)
Foreign exchange contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	(33)	(39)
Credit contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	0	1
Embedded derivatives
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	$ (41)	$ (9)

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4A
-Subparagraph (b)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-4A

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