Adoption of ASU 2018-12 - Summary of Changes in DFEL (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]
DFEL	$ 5,923	$ 5,115		$ 3,586
UL and Other
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
DFEL	5,579	4,766	$ 3,934	3,262
As Previously Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
DFEL		5,765		396
As Previously Reported | UL and Other
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
DFEL				77
Adoption of New Accounting Standard | Accounting Standards Update 2018-12
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
DFEL		(650)		3,190
Adoption of New Accounting Standard | Accounting Standards Update 2018-12 | UL and Other
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
DFEL				3,185
Variable Annuities
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
DFEL	$ 300	$ 310	$ 318	324
Variable Annuities | As Previously Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
DFEL				319
Variable Annuities | Adoption of New Accounting Standard | Accounting Standards Update 2018-12
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
DFEL				$ 5