MRBs - Reconciles of MRBs Assets and Liabilities (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024	Dec. 31, 2023
Market Risk Benefit [Line Items]
Assets	$ 4,157	$ 4,860
Liabilities	1,306	1,046
Net (Assets) Liabilities	(2,851)	(3,814)
Variable Annuities
Market Risk Benefit [Line Items]
Assets	4,041	4,737
Liabilities	1,165	933
Net (Assets) Liabilities	(2,876)	(3,804)	$ (3,604)	$ (2,180)
Fixed Annuities
Market Risk Benefit [Line Items]
Assets	73	78
Liabilities	137	110
Net (Assets) Liabilities	64	32	27	32
Retirement Plan Services
Market Risk Benefit [Line Items]
Assets	43	45
Liabilities	4	3
Net (Assets) Liabilities	$ (39)	$ (42)	$ (35)	$ (30)