Shares and Stockholders' Equity - Components and Changes in AOCI (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Change in our unrealized gain on derivative instruments in accumulated OCI
Balance as of beginning-of-period	$ 6,893
Balance as of end-of-period	9,013	$ 3,199
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-period	(5,188)	(8,916)
Income tax benefit (expense)	(276)	707
Reclassification adjustment for gains (losses) included in net income (loss)	(163)	(1,145)
Income tax benefit (expense)	34	240
Balance as of end-of-period	(4,038)	(10,703)
Unrealized holding gains (losses) arising during the year
Change in our unrealized gain on derivative instruments in accumulated OCI
Changes arising during the year	1,555	(3,405)
Change in foreign currency exchange rate adjustment
Change in our unrealized gain on derivative instruments in accumulated OCI
Changes arising during the year	124	(21)
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	(382)	27
Unrealized Gain (Loss) on Derivative Instruments
Change in our unrealized gain on derivative instruments in accumulated OCI
Balance as of beginning-of-period	375	388
Income tax benefit (expense)	(39)	(55)
Reclassification adjustment for gains (losses) included in net income (loss)	60	68
Income tax benefit (expense)	(13)	(14)
Balance as of end-of-period	473	540
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	305	231
Change in foreign currency exchange rate adjustment
Change in our unrealized gain on derivative instruments in accumulated OCI
Changes arising during the year	(121)	30
Market Risk Benefit Non-Performance Risk Gain (Loss)
Change in our unrealized gain on derivative instruments in accumulated OCI
Balance as of beginning-of-period	1,070	1,741
Adjustment arising during the year	(367)	(944)
Income tax benefit (expense)	78	202
Balance as of end-of-period	781	999
Policyholder Liability Discount Rate Remeasurement Gain (Loss)
Change in our unrealized gain on derivative instruments in accumulated OCI
Balance as of beginning-of-period	587	747
Adjustment arising during the year	(209)	347
Income tax benefit (expense)	44	(73)
Balance as of end-of-period	422	1,021
Foreign Currency Translation Adjustment
Change in our unrealized gain on derivative instruments in accumulated OCI
Balance as of beginning-of-period	(26)	(34)
Foreign currency translation adjustment arising during the year	8	1
Balance as of end-of-period	(18)	(33)
Funded Status of Employee Benefit Plans
Change in our unrealized gain on derivative instruments in accumulated OCI
Balance as of beginning-of-period	(294)	(278)
Adjustment arising during the year	(8)	(26)
Balance as of end-of-period	$ (302)	$ (304)