Derivative Instruments - Change in Our Unrealized Gain on Derivative Instruments in AOCI (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Change in our unrealized gain on derivative instruments in accumulated OCI
Balance as of beginning-of-year	$ 10,512
Balance as of end-of-period	11,814	$ 10,783
Unrealized Gain (Loss) on Derivative Instruments
Change in our unrealized gain on derivative instruments in accumulated OCI
Balance as of beginning-of-year	402	249
Income tax benefit (expense)	37	(20)
Reclassification adjustment for gains (losses) included in net income (loss)	44	40
Income tax benefit (expense)	(9)	(8)
Balance as of end-of-period	234	289
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)	0	(2)
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)	42	41
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)	2	1
Unrealized holding gains (losses)
Change in our unrealized gain on derivative instruments in accumulated OCI
Foreign currency translation adjustment arising during the year	263	213
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	29	46
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	234	167
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	$ (433)	$ (121)