DAC, VOBA, DSI, and DFEL (Reconciliation of DFEL) (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2012
Changes in DAC [Roll Forward]
DFEL	$ 5,646	$ 5,045
UL and Other [Member]
Changes in DAC [Roll Forward]
DFEL	5,343	4,735	$ 3,902	$ 4,735
Variable Annuities [Member]
Changes in DAC [Roll Forward]
DFEL	$ 303	$ 310	$ 318	$ 310