MRBs - Reconciles of MRBs Assets and Liabilities (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025	Mar. 31, 2025	Dec. 31, 2024
Market Risk Benefit [Line Items]
Assets	$ 4,303	$ 4,753
Liabilities	1,127	1,118
Net (Assets) Liabilities	(3,176)	(3,635)
Variable Annuities
Market Risk Benefit [Line Items]
Assets	4,210	4,655
Liabilities	957	940
Net (Assets) Liabilities	(3,253)	(3,715)	$ (2,876)	$ (3,804)
Fixed Annuities
Market Risk Benefit [Line Items]
Assets	49	51
Liabilities	168	175
Net (Assets) Liabilities	119	124	64	32
Retirement Plan Services
Market Risk Benefit [Line Items]
Assets	44	47
Liabilities	2	3
Net (Assets) Liabilities	$ (42)	$ (44)	$ (39)	$ (42)