Shares and Stockholders' Equity - Components and Changes in AOCI (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Change in our unrealized gain on derivative instruments in accumulated OCI
Balance as of beginning-of-year	$ 11,986
Balance as of end-of-period	11,784	$ 10,291
Unrealized Gain (Loss) on Fixed Maturity AFS Securities and Certain Other Investments
Change in our unrealized gain on derivative instruments in accumulated OCI
Balance as of beginning-of-year	(2,482)	(3,655)
Income tax benefit (expense)	118	(43)
Reclassification adjustment for gains (losses) included in net income (loss)	(23)	(20)
Income tax benefit (expense)	5	4
Balance as of end-of-period	(2,902)	(3,478)
Unrealized holding gains (losses)
Change in our unrealized gain on derivative instruments in accumulated OCI
Foreign currency translation adjustment arising during the year	(1,072)	591
Change in foreign currency exchange rate adjustment
Change in our unrealized gain on derivative instruments in accumulated OCI
Foreign currency translation adjustment arising during the year	(77)	156
Change in future contract benefits and policyholder account balances, net of reinsurance
Change in our unrealized gain on derivative instruments in accumulated OCI
Foreign currency translation adjustment arising during the year	593	(543)
Unrealized Gain (Loss) on Derivative Instruments
Change in our unrealized gain on derivative instruments in accumulated OCI
Balance as of beginning-of-year	213	402
Income tax benefit (expense)	(29)	(6)
Reclassification adjustment for gains (losses) included in net income (loss)	16	18
Income tax benefit (expense)	(3)	(4)
Balance as of end-of-period	309	410
Unrealized holding gains (losses)
Change in our unrealized gain on derivative instruments in accumulated OCI
Foreign currency translation adjustment arising during the year	62	181
Change in foreign currency exchange rate adjustment
Change in our unrealized gain on derivative instruments in accumulated OCI
Foreign currency translation adjustment arising during the year	76	(153)
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	(261)	145
Foreign currency translation adjustment arising during the year	559	403
Income tax benefit (expense)	(118)	(85)
Balance as of end-of-period	180	463
Policyholder Liability Discount Rate Remeasurement Gain (Loss)
Change in our unrealized gain on derivative instruments in accumulated OCI
Balance as of beginning-of-year	589	795
Foreign currency translation adjustment arising during the year	50	(100)
Income tax benefit (expense)	(11)	21
Balance as of end-of-period	628	716
Funded Status of Employee Benefit Plans
Change in our unrealized gain on derivative instruments in accumulated OCI
Balance as of beginning-of-year	(14)	(17)
Balance as of end-of-period	$ (14)	$ (17)