Derivative Instruments - Change in Our Unrealized Gain on Derivative Instruments in AOCI (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Change in our unrealized gain on derivative instruments in accumulated OCI
Balance as of beginning-of-year	$ 10,507
Balance as of end-of-period	10,783	$ 7,318
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
Income tax benefit (expense)	(20)	(9)
Reclassification adjustment for gains (losses) included in net income (loss)	40	46
Income tax benefit (expense)	(8)	(10)
Balance as of end-of-period	289	296
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)	(2)	0
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)	41	42
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	4
Unrealized holding gains (losses) arising during the period
Change in our unrealized gain on derivative instruments in accumulated OCI
Change in foreign currency exchange rate adjustment	213	10
Unrealized holding gains (losses) arising during the period | Interest rate contracts
Change in our unrealized gain on derivative instruments in accumulated OCI
Change in foreign currency exchange rate adjustment	46	102
Unrealized holding gains (losses) arising during the period | Foreign currency contracts
Change in our unrealized gain on derivative instruments in accumulated OCI
Change in foreign currency exchange rate adjustment	167	(92)
Change in foreign currency exchange rate adjustment
Change in our unrealized gain on derivative instruments in accumulated OCI
Change in foreign currency exchange rate adjustment	$ (121)	$ 30