Derivative Instruments - Change in Our Unrealized Gain on Derivative Instruments in AOCI (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Change in our unrealized gain on derivative instruments in accumulated OCI
Balance as of beginning-of-year	$ 8,269	$ 6,893
Balance as of end-of-year	10,906	8,269	$ 6,893
Net Investment Income | Qualifying Hedges
Change in our unrealized gain on derivative instruments in accumulated OCI
Hedged items			(5)
Derivatives designated as hedging instruments			5
Interest and Debt Expense | Qualifying Hedges
Change in our unrealized gain on derivative instruments in accumulated OCI
Hedged items			(5)
Derivatives designated as hedging instruments			5
Interest rate contracts | Realized Gain (Loss) | Qualifying Hedges
Change in our unrealized gain on derivative instruments in accumulated OCI
Hedged items	0	0	0
Derivatives designated as hedging instruments	0	0	0
Interest rate contracts | Net Investment Income | Qualifying Hedges
Change in our unrealized gain on derivative instruments in accumulated OCI
Hedged items	11	(30)
Derivatives designated as hedging instruments	(11)	30
Interest rate contracts | Interest and Debt Expense | Qualifying Hedges
Change in our unrealized gain on derivative instruments in accumulated OCI
Hedged items	(34)	27
Derivatives designated as hedging instruments	34	(27)
Foreign currency contracts | Realized Gain (Loss) | Qualifying Hedges
Change in our unrealized gain on derivative instruments in accumulated OCI
Hedged items	0	0
Derivatives designated as hedging instruments	0	0
Foreign currency contracts | Net Investment Income | Qualifying Hedges
Change in our unrealized gain on derivative instruments in accumulated OCI
Hedged items	3	(2)
Derivatives designated as hedging instruments	(3)	2
Foreign currency contracts | Interest and Debt Expense | Qualifying Hedges
Change in our unrealized gain on derivative instruments in accumulated OCI
Hedged items	0	0
Derivatives designated as hedging instruments	0	0
Unrealized Gain (Loss) on Derivative Instruments
Change in our unrealized gain on derivative instruments in accumulated OCI
Balance as of beginning-of-year	638	375	388
Income tax benefit (expense)	37	(88)	(15)
Reclassification adjustment for gains (losses) included in net income (loss)	65	89	91
Income tax benefit (expense)	(14)	(19)	(19)
Balance as of end-of-year	450	638	375
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)	0	(3)	(1)
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)	11	25	31
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)	(3)	8	7
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)	57	59	54
Unrealized holding gains (losses) | Interest rate contracts
Change in our unrealized gain on derivative instruments in accumulated OCI
Changes arising during the year	29	180	293
Unrealized holding gains (losses) | Foreign currency contracts
Change in our unrealized gain on derivative instruments in accumulated OCI
Changes arising during the year	208	21	(50)
Change in foreign currency exchange rate adjustment
Change in our unrealized gain on derivative instruments in accumulated OCI
Changes arising during the year	$ (411)	$ 220	$ (169)