MRBs (Reconciles Of MRBs Assets And Liabilities) (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022	Dec. 31, 2021
Market Risk Benefit [Line Items]
Assets	$ 4,108	$ 2,807
Liabilities	1,385	2,078
Net (Assets) Liabilities	(2,723)	(729)
Retirement Plan Services [Member]
Market Risk Benefit [Line Items]
Assets	37	24
Liabilities	4	2
Net (Assets) Liabilities	(33)	(22)	$ (1)
Variable Annuities [Member]
Market Risk Benefit [Line Items]
Assets	3,966	2,666
Liabilities	1,293	2,004
Net (Assets) Liabilities	(2,673)	(662)	2,398
Fixed Annuities [Member]
Market Risk Benefit [Line Items]
Assets	105	117
Liabilities	88	72
Net (Assets) Liabilities	$ (17)	$ (45)	$ 114