MRBs - Reconciles of MRBs Assets and Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023	Jun. 30, 2023	Dec. 31, 2022
Market Risk Benefit [Line Items]
Assets	$ 4,754	$ 3,894
Liabilities	1,275	1,716
Net (Assets) Liabilities	(3,479)	(2,178)
Variable Annuities
Market Risk Benefit [Line Items]
Assets	4,620	3,763
Liabilities	1,152	1,583
Net (Assets) Liabilities	(3,468)	(2,180)	$ (2,296)	$ (662)
Fixed Annuities
Market Risk Benefit [Line Items]
Assets	95	96
Liabilities	119	128
Net (Assets) Liabilities	24	32	(34)	(45)
Retirement Plan Services
Market Risk Benefit [Line Items]
Assets	39	35
Liabilities	4	5
Net (Assets) Liabilities	$ (35)	$ (30)	$ (28)	$ (22)