Shares and Stockholders' Equity - Components and Changes in AOCI (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Change in our unrealized gain on derivative instruments in accumulated OCI
Balance as of beginning-of-year	$ 10,507
Balance as of end-of-period	11,175	$ 10,203
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	(3,532)	(8,526)
Income tax benefit (expense)	(120)	(455)
Reclassification adjustment for gains (losses) included in net income (loss)	(51)	(37)
Income tax benefit (expense)	(11)	(8)
Balance as of end-of-period	(3,054)	(6,830)
Unrealized holding gains (losses) arising during the period
Change in our unrealized gain on derivative instruments in accumulated OCI
Change in foreign currency exchange rate adjustment	(914)	2,307
Change in foreign currency exchange rate adjustment
Change in our unrealized gain on derivative instruments in accumulated OCI
Change in foreign currency exchange rate adjustment	(102)	75
Change in future contract benefits and policyholder account balances, net of reinsurance
Change in our unrealized gain on derivative instruments in accumulated OCI
Change in foreign currency exchange rate adjustment	1,574	(260)
Unrealized Gain (Loss) on Derivative Instruments
Change in our unrealized gain on derivative instruments in accumulated OCI
Balance as of beginning-of-year	249	301
Income tax benefit (expense)	(18)	(25)
Reclassification adjustment for gains (losses) included in net income (loss)	15	16
Income tax benefit (expense)	(3)	(3)
Income tax benefit (expense)	(3)	(3)
Balance as of end-of-period	304	382
Unrealized holding gains (losses) arising during the period
Change in our unrealized gain on derivative instruments in accumulated OCI
Change in foreign currency exchange rate adjustment	(16)	186
Change in foreign currency exchange rate adjustment
Change in our unrealized gain on derivative instruments in accumulated OCI
Change in foreign currency exchange rate adjustment	101	(67)
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	1,069	1,739
Adjustment arising during the year	(590)	1,306
Income tax benefit (expense)	126	(280)
Balance as of end-of-period	605	2,765
Policyholder Liability Discount Rate Remeasurement Gain (Loss)
Change in our unrealized gain on derivative instruments in accumulated OCI
Balance as of beginning-of-year	645	790
Adjustment arising during the year	133	(243)
Income tax benefit (expense)	(28)	53
Balance as of end-of-period	750	600
Funded Status of Employee Benefit Plans
Change in our unrealized gain on derivative instruments in accumulated OCI
Balance as of beginning-of-year	(16)	(17)
Balance as of end-of-period	$ (16)	$ (17)