Adoption Of ASU 2018-12 (Summary Of Changes In DAC, VOBA And DSI) (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Accounting Standards Update 2018-12 [Member]
DAC				$ 10,975
VOBA				900
DSI				229
DAC, VOBA and DSI	$ 6,079			12,104
As Previously Reported [Member] | Accounting Standards Update 2018-12 [Member]
DAC				5,565
VOBA				247
DSI				213
DAC, VOBA and DSI				6,025
Restatement Adjustments [Member] | Accounting Standards Update 2018-12 [Member]
DAC				5,410
VOBA				653
DSI				16
DAC, VOBA and DSI				6,079
Variable Annuities [Member]
DAC	3,748	$ 3,751	$ 3,717
DSI	123	128	139
Variable Annuities [Member] | Accounting Standards Update 2018-12 [Member]
DAC				3,570
DSI				150
Variable Annuities [Member] | As Previously Reported [Member] | Accounting Standards Update 2018-12 [Member]
DAC				3,518
DSI				148
Variable Annuities [Member] | Restatement Adjustments [Member] | Accounting Standards Update 2018-12 [Member]
DAC				52
DSI				2
Fixed Annuities [Member]
DAC	419	439	448
VOBA	15	17	20
DSI	20	23	27
Fixed Annuities [Member] | Accounting Standards Update 2018-12 [Member]
DAC				479
VOBA				23
DSI				30
Fixed Annuities [Member] | As Previously Reported [Member] | Accounting Standards Update 2018-12 [Member]
DAC				264
DSI				17
Fixed Annuities [Member] | Restatement Adjustments [Member] | Accounting Standards Update 2018-12 [Member]
DAC				215
VOBA				23
DSI				13
Traditional Life [Member]
DAC	1,373	1,333	1,195
VOBA	44	50	59
Traditional Life [Member] | Accounting Standards Update 2018-12 [Member]
DAC				1,082
VOBA				67
Traditional Life [Member] | As Previously Reported [Member] | Accounting Standards Update 2018-12 [Member]
DAC				1,082
VOBA				67
UL and Other [Member]
DAC	5,730	5,605	5,360
VOBA	433	465	511
DSI	29	30	31
UL and Other [Member] | Accounting Standards Update 2018-12 [Member]
DAC				5,425
VOBA				810
DSI				35
UL and Other [Member] | As Previously Reported [Member] | Accounting Standards Update 2018-12 [Member]
DAC				394
VOBA				180
DSI				35
UL and Other [Member] | Restatement Adjustments [Member] | Accounting Standards Update 2018-12 [Member]
DAC				5,031
VOBA				630
Retirement Plan Services [Member]
DAC	238	236	235
DSI	22	17	14
Retirement Plan Services [Member] | Accounting Standards Update 2018-12 [Member]
DAC				232
DSI				14
Retirement Plan Services [Member] | As Previously Reported [Member] | Accounting Standards Update 2018-12 [Member]
DAC				120
DSI				13
Retirement Plan Services [Member] | Restatement Adjustments [Member] | Accounting Standards Update 2018-12 [Member]
DAC				112
DSI				1
Group Protection [Member]
DAC	$ 147	$ 141	$ 140
Group Protection [Member] | Accounting Standards Update 2018-12 [Member]
DAC				187
Group Protection [Member] | As Previously Reported [Member] | Accounting Standards Update 2018-12 [Member]
DAC				$ 187