MRBs - Reconciles of MRBs Assets and Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Dec. 31, 2022
Market Risk Benefit [Line Items]
Assets	$ 4,565	$ 3,894
Liabilities	1,272	1,716
Net (Assets) Liabilities	(3,293)	(2,178)
Variable Annuities
Market Risk Benefit [Line Items]
Assets	4,448	3,763
Liabilities	1,121	1,583
Net (Assets) Liabilities	(3,327)	(2,180)	$ (2,673)	$ (662)
Fixed Annuities
Market Risk Benefit [Line Items]
Assets	73	96
Liabilities	147	128
Net (Assets) Liabilities	74	32	(17)	(45)
Retirement Plan Services
Market Risk Benefit [Line Items]
Assets	44	35
Liabilities	4	5
Net (Assets) Liabilities	$ (40)	$ (30)	$ (33)	$ (22)