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	$ 5,102	$ 19,915
Balance as of end-of-year	6,893	5,102	$ 19,915
Unrealized Gain (Loss) on Derivative Instruments
Change in our unrealized gain on derivative instruments in accumulated OCI
Balance as of beginning-of-year	388	(85)	(402)
Income tax benefit (expense)	(15)	(144)	(85)
Reclassification adjustment for gains (losses) included in net income (loss)	91	92	26
Income tax benefit (expense)	(19)	(19)	(5)
Balance as of end-of-year	375	388	(85)
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 | Interest rate contracts | Interest and Debt Expense
Change in our unrealized gain on derivative instruments in accumulated OCI
Reclassification adjustment for gains (losses) included in net income (loss)	31	(11)	(23)
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 | Cumulative Effect to Retained Earnings
Change in our unrealized gain on derivative instruments in accumulated OCI
Balance as of beginning-of-year			25
Unrealized holding gains (losses) arising during the year
Change in our unrealized gain on derivative instruments in accumulated OCI
Changes arising during the year	243	378	246
Unrealized holding gains (losses) arising during the year | Interest rate contracts
Change in our unrealized gain on derivative instruments in accumulated OCI
Changes arising during the year	293	196	116
Unrealized holding gains (losses) arising during the year | Foreign currency contracts
Change in our unrealized gain on derivative instruments in accumulated OCI
Changes arising during the year	(50)	182	130
Change in foreign currency exchange rate adjustment
Change in our unrealized gain on derivative instruments in accumulated OCI
Changes arising during the year	$ (169)	$ 312	$ 152