Derivative Instruments - Change in Our Unrealized Gain on Derivative Instruments in AOCI (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Change in our unrealized gain on derivative instruments in accumulated OCI
Balance as of beginning-of-period	$ 6,893
Balance as of end-of-period	7,949	$ 5,819
Unrealized Gain (Loss) on Derivative Instruments
Change in our unrealized gain on derivative instruments in accumulated OCI
Balance as of beginning-of-period	375	388
Income tax benefit (expense)	(62)	(26)
Reclassification adjustment for gains (losses) included in net income (loss)	42	43
Income tax benefit (expense)	(9)	(9)
Balance as of end-of-period	575	448
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)	0
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)	15	13
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)	29	27
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) arising during the period - cash flow hedges
Change in our unrealized gain on derivative instruments in accumulated OCI
Changes arising during the year	178	230
Unrealized holding gains (losses) arising during the period - cash flow hedges | Interest rate contracts
Change in our unrealized gain on derivative instruments in accumulated OCI
Changes arising during the year	150	150
Unrealized holding gains (losses) arising during the period - cash flow hedges | Foreign currency contracts
Change in our unrealized gain on derivative instruments in accumulated OCI
Changes arising during the year	28	80
Change in foreign currency exchange rate adjustment
Change in our unrealized gain on derivative instruments in accumulated OCI
Changes arising during the year	$ 117	$ (110)