Derivative Instruments - Change in Our Unrealized Gain on Derivative Instruments in AOCI (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Change in our unrealized gain on derivative instruments in accumulated OCI
Balance as of beginning-of-year	$ 10,507	$ 8,604
Balance as of end-of-year	10,512	10,507	$ 8,604
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	258
Income tax benefit (expense)	(54)	2	(34)
Reclassification adjustment for gains (losses) included in net income (loss)	64	60	103
Income tax benefit (expense)	(13)	(13)	(22)
Balance as of end-of-year	402	249	301
Unrealized Gain (Loss) on Derivative Instruments | Interest rate contracts
Change in our unrealized gain on derivative instruments in accumulated OCI
Changes arising during the year	17	212	(336)
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)	(3)	(1)	2
Unrealized Gain (Loss) on Derivative Instruments | Foreign currency contracts
Change in our unrealized gain on derivative instruments in accumulated OCI
Changes arising during the year	21	(50)	182
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)	59	54	62
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)	8	7	39
Unrealized Gain (Loss) on Derivative Instruments | Cash flow hedges
Change in our unrealized gain on derivative instruments in accumulated OCI
Changes arising during the year	$ 220	$ (169)	$ 312