Adoption of ASU 2018-12 - Summary of Changes in DAC, VOBA and DSI (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
DAC				$ 10,975
VOBA				900
DSI				229
DAC, VOBA and DSI	$ 12,397	$ 12,235		12,104
Variable Annuities
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
DAC	3,751	3,751	$ 3,717	3,570
DSI	122	128	139	150
DAC, VOBA and DSI	3,873	3,879
Fixed Annuities
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
DAC	421	439	448	479
VOBA	15	17	20	23
DSI	19	23	27	30
DAC, VOBA and DSI	455	479
Traditional Life
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
DAC	1,376	1,333	1,195	1,082
VOBA	42	50	59	67
DAC, VOBA and DSI	1,418	1,383
UL and Other
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
DAC	5,791	5,605	5,360	5,425
VOBA	413	465	511	810
DSI	28	30	31	35
DAC, VOBA and DSI	6,232	6,100
Group Protection
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
DAC	154	141	140	187
DAC, VOBA and DSI	154	141
Retirement Plan Services
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
DAC	239	236	235	232
DSI	26	17	$ 14	14
DAC, VOBA and DSI	$ 265	253
As Previously Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
DAC				5,565
VOBA				247
DSI				213
DAC, VOBA and DSI		13,803		6,025
As Previously Reported | Variable Annuities
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
DAC				3,518
DSI				148
As Previously Reported | Fixed Annuities
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
DAC				264
VOBA				0
DSI				17
As Previously Reported | Traditional Life
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
DAC				1,082
VOBA				67
As Previously Reported | UL and Other
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
DAC				394
VOBA				180
DSI				35
As Previously Reported | Group Protection
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
DAC				187
As Previously Reported | Retirement Plan Services
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
DAC				120
DSI				13
Adoption of New Accounting Standard | Accounting Standards Update 2018-12
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
DAC				5,410
VOBA				653
DSI				16
DAC, VOBA and DSI		$ (1,568)		6,079
Adoption of New Accounting Standard | Variable Annuities | Accounting Standards Update 2018-12
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
DAC				52
DSI				2
Adoption of New Accounting Standard | Fixed Annuities | Accounting Standards Update 2018-12
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
DAC				215
VOBA				23
DSI				13
Adoption of New Accounting Standard | Traditional Life | Accounting Standards Update 2018-12
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
DAC				0
VOBA				0
Adoption of New Accounting Standard | UL and Other | Accounting Standards Update 2018-12
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
DAC				5,031
VOBA				630
DSI				0
Adoption of New Accounting Standard | Group Protection | Accounting Standards Update 2018-12
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
DAC				0
Adoption of New Accounting Standard | Retirement Plan Services | Accounting Standards Update 2018-12
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
DAC				112
DSI				$ 1