Derivative Instruments - Change in Our Unrealized Gain on Derivative Instruments in AOCI (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2024	Jun. 30, 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	11,029	$ 10,401
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)	(35)	(20)
Reclassification adjustment for gains (losses) included in net income (loss)	27	30
Income tax benefit (expense)	(6)	(6)
Balance as of end-of-period	356	351
Unrealized Gain (Loss) on Derivative Instruments | Interest rate contracts | Net Investment Income
Change in our unrealized gain on derivative instruments in accumulated OCI
Reclassification adjustment for gains (losses) included in net income (loss)	(1)	0
Unrealized Gain (Loss) on Derivative Instruments | Foreign currency contracts | Net Investment Income
Change in our unrealized gain on derivative instruments in accumulated OCI
Reclassification adjustment for gains (losses) included in net income (loss)	29	27
Unrealized Gain (Loss) on Derivative Instruments | Foreign currency contracts | Realized Gain (Loss)
Change in our unrealized gain on derivative instruments in accumulated OCI
Reclassification adjustment for gains (losses) included in net income (loss)	(1)	3
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	46	204
Unrealized holding gains (losses) arising during the period | Interest rate contracts
Change in our unrealized gain on derivative instruments in accumulated OCI
Change in foreign currency exchange rate adjustment	18	124
Unrealized holding gains (losses) arising during the period | Foreign currency contracts
Change in our unrealized gain on derivative instruments in accumulated OCI
Change in foreign currency exchange rate adjustment	28	80
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	$ 117	$ (110)