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	$ 81,880	$ 82,300
Trading securities	2,203	2,321
Equity securities	319	306
Mortgage loans on real estate	19,176	18,873
Derivative investments	8,154	6,305
Other investments	4,988	4,757
Market risk benefit 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	$ 2,203	$ 2,321
Equity securities	319	306
Mortgage loans on real estate	19,176	18,873
Derivative investments	8,154	6,305
Other investments	4,988	4,757
Cash and invested cash	3,807	3,193
Market risk benefit assets	4,878	3,894
Other assets:
LPR ceded derivative	201	206
Separate account assets	166,225	158,257
Policyholder account balances:
Funds withheld reinsurance liabilities – reinsurance-related embedded derivatives	543	493
MRB liabilities	(1,266)	(1,716)
Short-term debt	(1,281)	(840)
Long-term debt	(2,179)	(2,195)
Fair Value
ASSETS
Trading securities	2,203	2,321
Equity securities	319	306
Mortgage loans on real estate	17,582	17,330
Derivative investments	8,154	6,305
Other investments	4,988	4,757
Cash and invested cash	3,807	3,193
Market risk benefit assets	4,878	3,894
Other assets:
LPR ceded derivative	201	206
Separate account assets	166,225	158,257
Policyholder account balances:
Funds withheld reinsurance liabilities – reinsurance-related embedded derivatives	543	493
MRB liabilities	(1,266)	(1,716)
Short-term debt	(1,282)	(841)
Long-term debt	(2,101)	(2,125)
Other assets | Carrying Value
Other assets:
Ceded MRBs	59	274
Indexed annuity ceded embedded derivatives	973	940
Other assets | Fair Value
Other assets:
Ceded MRBs	59	274
Indexed annuity ceded embedded derivatives	973	940
Policyholder account balances | Carrying Value
Policyholder account balances:
Account balances of certain investment contracts	(44,361)	(44,615)
RILA, fixed annuity and IUL contracts	(10,896)	(9,077)
Policyholder account balances | Fair Value
Policyholder account balances:
Account balances of certain investment contracts	(33,730)	(34,020)
RILA, fixed annuity and IUL contracts	(10,896)	(9,077)
Other liabilities | Carrying Value
Other liabilities:
Ceded MRBs	(2,261)	(1,149)
Derivative liabilities	(176)	(356)
Remaining guaranteed interest and similar contracts	(397)	(411)
Other liabilities | Fair Value
Other liabilities:
Ceded MRBs	(2,261)	(1,149)
Derivative liabilities	(176)	(356)
Remaining guaranteed interest and similar contracts	(397)	(411)
Fixed maturity AFS securities | Carrying Value
ASSETS
Fixed maturity AFS securities	81,880	82,300
Fixed maturity AFS securities | Fair Value
ASSETS
Fixed maturity AFS securities	$ 81,880	$ 82,300