MRBs - Reconciles of MRBs Assets and Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024	Jun. 30, 2024	Dec. 31, 2023
Market Risk Benefit [Line Items]
Assets	$ 4,577	$ 4,860
Liabilities	1,205	1,046
Net (Assets) Liabilities	(3,372)	(3,814)
Variable Annuities
Market Risk Benefit [Line Items]
Assets	4,467	4,737
Liabilities	1,047	933
Net (Assets) Liabilities	(3,420)	(3,804)	$ (3,468)	$ (2,180)
Fixed Annuities
Market Risk Benefit [Line Items]
Assets	64	78
Liabilities	154	110
Net (Assets) Liabilities	90	32	24	32
Retirement Plan Services
Market Risk Benefit [Line Items]
Assets	46	45
Liabilities	4	3
Net (Assets) Liabilities	$ (42)	$ (42)	$ (35)	$ (30)