Basis of Presentation (Details) $ in Millions	3 Months Ended		12 Months Ended			24 Months Ended
	Mar. 31, 2025 USD ($) country	Mar. 31, 2024 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Summary of Significant Accounting Policies [Line Items]
Number of countries in which the entity operates | country	200
Net income attributable to AIG	$ 698	$ 1,216
Income from continuing operations before income tax expense	960	$ 1,058
Revision of Prior Period, Adjustment
Summary of Significant Accounting Policies [Line Items]
Net income attributable to AIG	51		$ (68)	$ 19	$ 23	$ 77
Income from continuing operations before income tax expense	$ 140		$ (79)	$ 34	$ 42	$ 143