Shares and Stockholders' Equity - Components and Changes in AOCI (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Change in our unrealized gain on derivative instruments in accumulated OCI
Balance as of beginning-of-year	$ 10,512
Balance as of end-of-period	11,814	$ 10,783
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	(3,655)	(3,532)
Income tax benefit (expense)	(314)	(253)
Reclassification adjustment for gains (losses) included in net income (loss)	(8)	(9)
Income tax benefit (expense)	2	2
Balance as of end-of-period	(2,484)	(2,583)
Unrealized holding gains (losses)
Change in our unrealized gain on derivative instruments in accumulated OCI
Foreign currency translation adjustment arising during the year	1,936	1,523
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	440	125
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	(897)	(453)
Unrealized Gain (Loss) on Derivative Instruments
Change in our unrealized gain on derivative instruments in accumulated OCI
Balance as of beginning-of-year	402	249
Income tax benefit (expense)	37	(20)
Reclassification adjustment for gains (losses) included in net income (loss)	44	40
Income tax benefit (expense)	(9)	(8)
Balance as of end-of-period	234	289
Unrealized holding gains (losses)
Change in our unrealized gain on derivative instruments in accumulated OCI
Foreign currency translation adjustment arising during the year	263	213
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	(433)	(121)
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	145	1,069
Foreign currency translation adjustment arising during the year	(260)	(367)
Income tax benefit (expense)	56	79
Balance as of end-of-period	(59)	781
Policyholder Liability Discount Rate Remeasurement Gain (Loss)
Change in our unrealized gain on derivative instruments in accumulated OCI
Balance as of beginning-of-year	795	645
Foreign currency translation adjustment arising during the year	(254)	(46)
Income tax benefit (expense)	53	10
Balance as of end-of-period	594	609
Funded Status of Employee Benefit Plans
Change in our unrealized gain on derivative instruments in accumulated OCI
Balance as of beginning-of-year	(17)	(16)
Balance as of end-of-period	(17)	(16)
Foreign Currency Translation Adjustment
Change in our unrealized gain on derivative instruments in accumulated OCI
Balance as of beginning-of-year	0	0
Foreign currency translation adjustment arising during the year	0	(1)
Balance as of end-of-period	$ 0	$ (1)