Employee Benefit Arrangements - Net Periodic Benefit Costs and Other Changes in Plan Assets and Future Amortizaion of Prior Service Costs (Details) - Pension Plan - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Net Periodic (Benefit) Costs Recognized in Consolidated Statements of Operations:
Service cost	$ 30	$ 24	$ 28
Interest cost	102	103	72
Expected return on plan assets	(107)	(100)	(108)
(Gain) loss recognized due to curtailment	0	0	0
Net (gain) loss recognition	(26)	(4)	(6)
Net periodic (benefit) costs	$ (1)	$ 23	$ (14)
Discount rate, net benefit cost	5.28%	5.47%	3.00%
Expected rate of return on plan assets, net benefit cost	6.00%	5.82%	4.85%
Interest credit rate	3.75%	3.00%	2.80%