Shares and Stockholders' Equity - Components and Changes in AOCI (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Change in our unrealized gain on derivative instruments in accumulated OCI
Balance as of beginning-of-year	$ 8,269
Balance as of end-of-period	8,193	$ 7,546
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	(6,239)	(5,188)
Income tax benefit (expense)	(121)	71
Reclassification adjustment for gains (losses) included in net income (loss)	(90)	(55)
Income tax benefit (expense)	19	12
Balance as of end-of-period	(5,715)	(5,426)
Unrealized holding gains (losses) arising during the year
Change in our unrealized gain on derivative instruments in accumulated OCI
Changes arising during the year	744	(1,140)
Change in foreign currency exchange rate adjustment
Change in our unrealized gain on derivative instruments in accumulated OCI
Changes arising during the year	156	(103)
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	(326)	891
Unrealized Gain (Loss) on Derivative Instruments
Change in our unrealized gain on derivative instruments in accumulated OCI
Balance as of beginning-of-year	638	375
Income tax benefit (expense)	(4)	(35)
Reclassification adjustment for gains (losses) included in net income (loss)	21	24
Income tax benefit (expense)	(4)	(5)
Balance as of end-of-period	637	486
Unrealized holding gains (losses) arising during the period - cash flow hedges
Change in our unrealized gain on derivative instruments in accumulated OCI
Changes arising during the year	173	64
Change in foreign currency exchange rate adjustment
Change in our unrealized gain on derivative instruments in accumulated OCI
Changes arising during the year	(153)	101
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	146	1,070
Adjustment arising during the year	403	(590)
Income tax benefit (expense)	(85)	126
Balance as of end-of-period	464	606
Policyholder Liability Discount Rate Remeasurement Gain (Loss)
Change in our unrealized gain on derivative instruments in accumulated OCI
Balance as of beginning-of-year	744	587
Adjustment arising during the year	(141)	147
Income tax benefit (expense)	30	(31)
Balance as of end-of-period	633	703
Foreign Currency Translation Adjustment
Change in our unrealized gain on derivative instruments in accumulated OCI
Balance as of beginning-of-year	(29)	(26)
Foreign currency translation adjustment arising during the year	5	(1)
Balance as of end-of-period	(24)	(27)
Funded Status of Employee Benefit Plans
Change in our unrealized gain on derivative instruments in accumulated OCI
Balance as of beginning-of-year	(296)	(294)
Adjustment arising during the year	(5)	1
Balance as of end-of-period	$ (301)	$ (293)