Derivative Instruments - Change in Our Unrealized Gain on Derivative Instruments in AOCI (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Change in our unrealized gain on derivative instruments in accumulated OCI
Balance as of beginning-of-year	$ 8,604	$ 25,934
Balance as of end-of-year	10,507	8,604	$ 25,934
Cumulative effect from adoption of new accounting standards
Change in our unrealized gain on derivative instruments in accumulated OCI
Balance as of beginning-of-year			4,822
Unrealized Gain (Loss) on Derivative Instruments
Change in our unrealized gain on derivative instruments in accumulated OCI
Balance as of beginning-of-year	301	258	42
Income tax benefit (expense)	2	(34)	(63)
Reclassification adjustment for gains (losses) included in net income (loss)	(60)	(103)	(49)
Income tax benefit (expense)	(13)	(22)	(10)
Balance as of end-of-year	249	301	258
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	212	(336)	11
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	(2)	(3)
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	(50)	182	130
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)	(54)	(62)	(48)
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)	(7)	(39)	2
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	$ (169)	$ 312	152
Unrealized Gain (Loss) on Derivative Instruments | Cumulative effect from adoption of new accounting standards
Change in our unrealized gain on derivative instruments in accumulated OCI
Balance as of beginning-of-year			$ 25