Adoption of ASU 2018-12 (Summary of Changes in DAC, VOBA and DSI) (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Variable Annuities [Member]
DAC	$ 3,872	$ 3,880	$ 3,860
DSI	163	167	181
Accounting Standards Update 2018-12 [Member]
DAC				$ 11,000
VOBA				887
DSI				275
DAC, VOBA and DSI				12,162
Accounting Standards Update 2018-12 [Member] | Variable Annuities [Member]
DAC				3,727
DSI				196
Traditional Life [Member]
DAC	1,306	1,286	1,146
VOBA	48	50	59
Traditional Life [Member] | Accounting Standards Update 2018-12 [Member]
DAC				1,041
VOBA				67
UL and Other [Member]
DAC	5,565	5,518	5,269
VOBA	443	454	499
DSI	29	30	31
UL and Other [Member] | Accounting Standards Update 2018-12 [Member]
DAC				5,328
VOBA				797
DSI				35
Fixed Annuities [Member]
DAC	436	439	448
VOBA	17	17	20
DSI	22	23	27
Fixed Annuities [Member] | Accounting Standards Update 2018-12 [Member]
DAC				479
VOBA				23
DSI				30
Group Protection Segment [Member]
DAC	142	141	140
Group Protection Segment [Member] | Accounting Standards Update 2018-12 [Member]
DAC				187
Retirement Plan Services Segment [Member]
DAC	242	241	239
DSI	$ 19	$ 17	$ 14
Retirement Plan Services Segment [Member] | Accounting Standards Update 2018-12 [Member]
DAC				238
DSI				14
As Previously Reported [Member] | Accounting Standards Update 2018-12 [Member]
DAC				5,590
VOBA				234
DSI				259
DAC, VOBA and DSI				6,083
As Previously Reported [Member] | Accounting Standards Update 2018-12 [Member] | Variable Annuities [Member]
DAC				3,675
DSI				194
As Previously Reported [Member] | Traditional Life [Member] | Accounting Standards Update 2018-12 [Member]
DAC				1,041
VOBA				67
As Previously Reported [Member] | UL and Other [Member] | Accounting Standards Update 2018-12 [Member]
DAC				297
VOBA				167
DSI				35
As Previously Reported [Member] | Fixed Annuities [Member] | Accounting Standards Update 2018-12 [Member]
DAC				264
DSI				17
As Previously Reported [Member] | Group Protection Segment [Member] | Accounting Standards Update 2018-12 [Member]
DAC				187
As Previously Reported [Member] | Retirement Plan Services Segment [Member] | Accounting Standards Update 2018-12 [Member]
DAC				126
DSI				13
Restatement Adjustments [Member] | Accounting Standards Update 2018-12 [Member]
DAC				5,410
VOBA				653
DSI				16
DAC, VOBA and DSI				6,079
Restatement Adjustments [Member] | Accounting Standards Update 2018-12 [Member] | Variable Annuities [Member]
DAC				52
DSI				2
Restatement Adjustments [Member] | UL and Other [Member] | Accounting Standards Update 2018-12 [Member]
DAC				5,031
VOBA				630
Restatement Adjustments [Member] | Fixed Annuities [Member] | Accounting Standards Update 2018-12 [Member]
DAC				215
VOBA				23
DSI				13
Restatement Adjustments [Member] | Retirement Plan Services Segment [Member] | Accounting Standards Update 2018-12 [Member]
DAC				112
DSI				$ 1