Market Risk Benefits - Rollforward of the Net MRB (Assets) Liabilities for Variable Annuities (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2024	Dec. 31, 2023
Market Risk Benefit [Roll Forward]
Net MRB balance, beginning of period	$ (1,952)
Net MRB balance, end of period, gross	(4,666)	$ (1,952)
Reinsurance recoverable on market risk benefits at fair value, end of period	(121)	(149)
Variable annuity
Market Risk Benefit [Roll Forward]
Net MRB balance, beginning of period	(2,000)	767
Beginning of period cumulative effect of changes in non-performance risk	972	2,185
Net MRB balance, beginning of period, before effect of changes in non-performance risk	(1,028)	2,952
Effect of changes in interest rates	(2,258)	(733)
Effect of fund performance	(2,191)	(5,401)
Effect of changes in equity index volatility	(305)	(1,107)
Effect of expected policyholder behavior	383	612
Effect of actual policyholder behavior different from expected	331	483
Effect of time	779	1,829
Effect of changes in assumptions	4	337
Net MRB balance, end of period, before effect of changes in non-performance risk	(4,285)	(1,028)
End of period cumulative effect of changes in non-performance risk	430	972
Net MRB balance, end of period, gross	(4,715)	(2,000)
Reinsurance recoverable on market risk benefits at fair value, end of period	(68)	(90)
Net MRB balance, end of period, net of reinsurance	$ (4,783)	$ (2,090)
Weighted average attained age (years)	69 years	69 years
Net amount at risk	$ 6,455	$ 8,225