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Overview and Basis of Presentation (Details) $ / shares in Units, € in Millions, £ in Millions, shares in Millions						3 Months Ended				6 Months Ended		12 Months Ended
	Apr. 08, 2024 USD ($)	Apr. 08, 2024 GBP (£)	Oct. 31, 2023 USD ($)	Oct. 31, 2023 EUR (€)	Sep. 19, 2022 USD ($)	Mar. 31, 2025 shares	Jun. 30, 2024 USD ($) $ / shares	Mar. 31, 2024 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($) $ / shares	Jun. 30, 2023 USD ($)	Dec. 31, 2023 USD ($) $ / shares
Other Ownership Interests [Line Items]
Common stock, par value (in dollars per share) \| $ / shares							$ 0.01			$ 0.01		$ 0.01
Net (gain) loss on divestitures							$ 241,000,000		$ 59,000,000	$ 246,000,000	$ 56,000,000
Assets held-for-sale							113,000,000			113,000,000		$ 2,237,000,000
Liabilities held-for-sale							0			0		1,746,000,000
Total net investment income							$ 2,988,000,000		$ 2,714,000,000	5,912,000,000	$ 5,409,000,000
Revision of Prior Period, Adjustment
Other Ownership Interests [Line Items]
Total net investment income								$ 67,000,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations \| Laya Healthcare Limited
Other Ownership Interests [Line Items]
Proceeds from sale of business			$ 731,000,000	€ 691
Net (gain) loss on divestitures												$ 652,000,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations \| AIG Life Limited
Other Ownership Interests [Line Items]
Proceeds from sale of business	$ 569,000,000	£ 453
Net (gain) loss on divestitures										$ 246,000,000
Corebridge Financial
Other Ownership Interests [Line Items]
Stock issued in IPO (in shares)					$ 80,000,000.0
Corebridge Financial \| Stock Purchase Agreement \| AIG \| Forecast
Other Ownership Interests [Line Items]
Number of shares to be sold (in shares) \| shares						122.0
Common stock ownership interest (as a percent)						20.00%
Corebridge Financial Inc
Other Ownership Interests [Line Items]
Ownership percentage (as a percent)							49.00%			49.00%