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Overview and Basis of Presentation (Details) $ / shares in Units, € in Millions, £ in Millions, shares in Millions						3 Months Ended		12 Months Ended	18 Months Ended
	Apr. 08, 2024 USD ($)	Apr. 08, 2024 GBP (£)	Oct. 31, 2023 USD ($)	Oct. 31, 2023 EUR (€)	Sep. 19, 2022 USD ($)	Mar. 31, 2024 USD ($) $ / shares	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($) $ / shares	Mar. 31, 2024 USD ($) $ / shares shares
Other Ownership Interests [Line Items]
Common stock, par value (in dollars per share) \| $ / shares						$ 0.01		$ 0.01	$ 0.01
Gain on disposal of business						$ 5,000,000	$ (3,000,000)
Total net investment income						2,924,000,000	$ 2,695,000,000
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
Gain on disposal of business								$ 652,000,000
Disposal Group, Held-for-Sale, Not Discontinued Operations \| AIG Life Limited \| Subsequent Event
Other Ownership Interests [Line Items]
Proceeds from sale of business	$ 569,000,000	£ 453
Corebridge Financial
Other Ownership Interests [Line Items]
Stock issued in IPO (in shares)					$ 80,000,000				$ 159,800,000
Stock repurchased (in shares) \| shares									17.2
Corebridge Financial Inc
Other Ownership Interests [Line Items]
Ownership percentage (as a percent)						52.70%			52.70%