Fair Value of Financial Instruments - Carrying and Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
ASSETS
Fixed maturity AFS securities	$ 87,764	$ 88,738
Trading securities	2,227	2,359
Equity securities	319	306
Mortgage loans on real estate	19,266	18,963
Derivative investments	8,394	6,474
Other investments	5,256	5,015
MRB assets	4,878	3,894
Policyholder account balances:
MRB liabilities	$ (1,266)	$ (1,716)
Other liabilities:
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Other liabilities	Other liabilities
Carrying Value
ASSETS
Trading securities	$ 2,227	$ 2,359
Equity securities	319	306
Mortgage loans on real estate	19,266	18,963
Derivative investments	8,394	6,474
Other investments	5,256	5,015
Cash and invested cash	4,122	3,365
MRB assets	4,878	3,894
Other assets:
Separate account assets	166,225	158,257
Policyholder account balances:
Funds withheld reinsurance liabilities – reinsurance-related embedded derivatives	(355)	(552)
MRB liabilities	(1,266)	(1,716)
Short-term debt	(503)	(250)
Long-term debt	(5,726)	(5,699)
Fair Value
ASSETS
Trading securities	2,227	2,359
Equity securities	319	306
Mortgage loans on real estate	17,658	17,407
Derivative investments	8,394	6,474
Other investments	5,256	5,015
Cash and invested cash	4,122	3,365
MRB assets	4,878	3,894
Other assets:
Separate account assets	166,225	158,257
Policyholder account balances:
Funds withheld reinsurance liabilities – reinsurance-related embedded derivatives	(355)	(552)
MRB liabilities	(1,266)	(1,716)
Short-term debt	(493)	(249)
Long-term debt	(5,058)	(5,182)
Other Assets | Carrying Value
Other assets:
Ceded MRBs	2	2
Indexed annuity ceded embedded derivatives	973	940
Other Assets | Fair Value
Other assets:
Ceded MRBs	2	2
Indexed annuity ceded embedded derivatives	973	940
Policyholder Account Balances | Carrying Value
Policyholder account balances:
Account balances of certain investment contracts	(44,386)	(44,640)
RILA, fixed annuity and IUL contracts	(10,896)	(9,077)
Policyholder Account Balances | Fair Value
Policyholder account balances:
Account balances of certain investment contracts	(33,752)	(34,041)
RILA, fixed annuity and IUL contracts	(10,896)	(9,077)
Other Liabilities | Carrying Value
Other liabilities:
Ceded MRBs	(360)	(239)
Derivative liabilities	(186)	(356)
Remaining guaranteed interest and similar contracts	(397)	(411)
Other Liabilities | Fair Value
Other liabilities:
Ceded MRBs	(360)	(239)
Derivative liabilities	(186)	(356)
Remaining guaranteed interest and similar contracts	(397)	(411)
Fixed maturity AFS securities, at fair value | Carrying Value
ASSETS
Fixed maturity AFS securities	87,764	88,738
Fixed maturity AFS securities, at fair value | Fair Value
ASSETS
Fixed maturity AFS securities	$ 87,764	$ 88,738