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				$ 11,000
Balance as of beginning-of-year				887
Balance as of end-of-year				275
DAC, VOBA and DSI	$ 12,418	$ 12,263		12,162
Variable Annuities
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
DAC	3,868	3,880	$ 3,860	3,727
Balance as of end-of-year	157	167	181	196
DAC, VOBA and DSI	4,025	4,047
Fixed Annuities
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
DAC	421	439	448	479
Balance as of beginning-of-year	15	17	20	23
Balance as of end-of-year	20	23	27	30
DAC, VOBA and DSI	456	479
Traditional Life
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
DAC	1,332	1,286	1,146	1,041
Balance as of beginning-of-year	42	50	59	67
DAC, VOBA and DSI	1,374	1,336
UL and Other
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
DAC	5,709	5,518	5,269	5,328
Balance as of beginning-of-year	402	454	499	797
Balance as of end-of-year	28	30	31	35
DAC, VOBA and DSI	6,139	6,002
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	244	241	239	238
Balance as of end-of-year	26	17	$ 14	14
DAC, VOBA and DSI	$ 270	258
As Previously Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
DAC				5,590
Balance as of beginning-of-year				234
Balance as of end-of-year				259
DAC, VOBA and DSI		13,873		6,083
As Previously Reported | Variable Annuities
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
DAC				3,675
Balance as of end-of-year				194
As Previously Reported | Fixed Annuities
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
DAC				264
Balance as of beginning-of-year				0
Balance as of end-of-year				17
As Previously Reported | Traditional Life
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
DAC				1,041
Balance as of beginning-of-year				67
As Previously Reported | UL and Other
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
DAC				297
Balance as of beginning-of-year				167
Balance as of end-of-year				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				126
Balance as of end-of-year				13
Adoption of New Accounting Standard | Accounting Standards Update 2018-12
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
DAC				5,410
Balance as of beginning-of-year				653
Balance as of end-of-year				16
DAC, VOBA and DSI		$ (1,610)		6,079
Adoption of New Accounting Standard | Accounting Standards Update 2018-12 | Variable Annuities
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
DAC				52
Balance as of end-of-year				2
Adoption of New Accounting Standard | Accounting Standards Update 2018-12 | Fixed Annuities
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
DAC				215
Balance as of beginning-of-year				23
Balance as of end-of-year				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
Balance as of beginning-of-year				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
Balance as of beginning-of-year				630
Balance as of end-of-year				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
Balance as of end-of-year				$ 1