Shares and Stockholders' Equity - Components and Changes in AOCI (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Change in our unrealized gain on derivative instruments in accumulated OCI
Balance as of beginning-of-year	$ 6,893	$ 5,102
Balance as of end-of-year	8,269	6,893	$ 5,102
Unrealized Gain (Loss) on Fixed Maturity AFS Securities and Certain
Change in our unrealized gain on derivative instruments in accumulated OCI
Balance as of beginning-of-year	(5,188)	(8,916)	9,616
Income tax benefit (expense)	317	(849)	5,039
Reclassification adjustment for gains (losses) included in net income (loss)	(205)	(860)	(15)
Income tax benefit (expense)	43	181	3
Balance as of end-of-year	(6,239)	(5,188)	(8,916)
Unrealized holding gains (losses) arising during the year
Change in our unrealized gain on derivative instruments in accumulated OCI
Changes arising during the year	(1,787)	2,413	(25,552)
Change in foreign currency exchange rate adjustment
Change in our unrealized gain on derivative instruments in accumulated OCI
Changes arising during the year	(220)	179	(322)
Change in future contract benefits and policyholder account balances, net of reinsurance
Change in our unrealized gain on derivative instruments in accumulated OCI
Changes arising during the year	477	1,306	2,291
Unrealized Gain (Loss) on Derivative Instruments
Change in our unrealized gain on derivative instruments in accumulated OCI
Balance as of beginning-of-year	375	388	(85)
Income tax benefit (expense)	(88)	(15)	(144)
Reclassification adjustment for gains (losses) included in net income (loss)	89	91	92
Income tax benefit (expense)	(19)	(19)	(19)
Balance as of end-of-year	638	375	388
Unrealized holding gains (losses) arising during the year
Change in our unrealized gain on derivative instruments in accumulated OCI
Changes arising during the year	201	243	378
Change in foreign currency exchange rate adjustment
Change in our unrealized gain on derivative instruments in accumulated OCI
Changes arising during the year	220	(169)	312
Market Risk Benefit Non-Performance Risk Gain (Loss)
Change in our unrealized gain on derivative instruments in accumulated OCI
Balance as of beginning-of-year	1,070	1,741	1,951
Adjustment arising during the year	(1,175)	(854)	(266)
Income tax benefit (expense)	251	183	56
Balance as of end-of-year	146	1,070	1,741
Policyholder Liability Discount Rate Remeasurement Gain (Loss)
Change in our unrealized gain on derivative instruments in accumulated OCI
Balance as of beginning-of-year	587	747	(1,265)
Adjustment arising during the year	198	(206)	2,559
Income tax benefit (expense)	(41)	46	(547)
Balance as of end-of-year	744	587	747
Foreign Currency Translation Adjustment
Change in our unrealized gain on derivative instruments in accumulated OCI
Balance as of beginning-of-year	(26)	(34)	(14)
Foreign currency translation adjustment arising during the year	(3)	8	(20)
Balance as of end-of-year	(29)	(26)	(34)
Funded Status of Employee Benefit Plans
Change in our unrealized gain on derivative instruments in accumulated OCI
Balance as of beginning-of-year	(294)	(278)	(219)
Adjustment arising during the year	(5)	(13)	(74)
Income tax benefit (expense)	3	(3)	15
Balance as of end-of-year	$ (296)	$ (294)	$ (278)