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	$ 6,893
Balance as of end-of-period	7,546	$ 6,732
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)
Income tax benefit (expense)	71	(465)
Reclassification adjustment for gains (losses) included in net income (loss)	(55)	(39)
Income tax benefit (expense)	12	8
Balance as of end-of-period	(5,426)	(7,177)
Unrealized holding gains (losses) arising during the year
Change in our unrealized gain on derivative instruments in accumulated OCI
Changes arising during the year	(1,140)	2,357
Change in foreign currency exchange rate adjustment
Change in our unrealized gain on derivative instruments in accumulated OCI
Changes arising during the year	(103)	76
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	891	(260)
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
Income tax benefit (expense)	(35)	(15)
Reclassification adjustment for gains (losses) included in net income (loss)	24	22
Income tax benefit (expense)	(5)	(5)
Balance as of end-of-period	486	423
Unrealized holding gains (losses) arising during the year
Change in our unrealized gain on derivative instruments in accumulated OCI
Changes arising during the year	64	134
Change in foreign currency exchange rate adjustment
Change in our unrealized gain on derivative instruments in accumulated OCI
Changes arising during the year	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	1,070	1,741
Adjustment arising during the year	(590)	1,306
Income tax benefit (expense)	126	(281)
Balance as of end-of-period	606	2,766
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
Adjustment arising during the year	147	(258)
Income tax benefit (expense)	(31)	56
Balance as of end-of-period	703	545
Foreign Currency Translation Adjustment
Change in our unrealized gain on derivative instruments in accumulated OCI
Balance as of beginning-of-year	(26)	(34)
Foreign currency translation adjustment arising during the year	(1)	3
Balance as of end-of-period	(27)	(31)
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)
Adjustment arising during the year	1	(2)
Balance as of end-of-period	$ (293)	$ (280)