MRBs (Reconciles of MRBs Assets and Liabilities) (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Market Risk Benefit [Line Items]
Assets	$ 3,445	$ 2,807
Liabilities	1,976	2,078
Net (Assets) Liabilities	(1,469)	(729)
Retirement Plan Services [Member]
Market Risk Benefit [Line Items]
Assets	26	24
Liabilities		2
Net (Assets) Liabilities	(26)	(22)	$ (1)
Variable Annuities [Member]
Market Risk Benefit [Line Items]
Assets	3,305	2,666
Liabilities	1,893	2,004
Net (Assets) Liabilities	(1,412)	(662)	2,398
Fixed Annuities [Member]
Market Risk Benefit [Line Items]
Assets	114	117
Liabilities	83	72
Net (Assets) Liabilities	$ (31)	$ (45)	$ 114