Derivative Instruments - Change in Our Unrealized Gain on Derivative Instruments in AOCI (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Change in our unrealized gain on derivative instruments in accumulated OCI
Balance as of beginning-of-year	$ 11,986
Balance as of end-of-period	11,784	$ 10,291
Unrealized Gain (Loss) on Derivative Instruments
Change in our unrealized gain on derivative instruments in accumulated OCI
Balance as of beginning-of-year	213	402
Income tax benefit (expense)	(29)	(6)
Reclassification adjustment for gains (losses) included in net income (loss)	16	18
Income tax benefit (expense)	(3)	(4)
Balance as of end-of-period	309	410
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)	15	15
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)
Change in our unrealized gain on derivative instruments in accumulated OCI
Foreign currency translation adjustment arising during the year	62	181
Unrealized holding gains (losses) | Interest rate contracts
Change in our unrealized gain on derivative instruments in accumulated OCI
Foreign currency translation adjustment arising during the year	(7)	13
Unrealized holding gains (losses) | Foreign currency contracts
Change in our unrealized gain on derivative instruments in accumulated OCI
Foreign currency translation adjustment arising during the year	69	168
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	$ 76	$ (153)