Derivative Instruments - Credit Derivatives, Protection Sold, Notional and Fair Value (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Protection sold credit derivatives ratings/maturity profile
Protection sold credit derivatives ratings/maturity profile - less than 1 year	$ (303,111)	$ (178,099)
Protection sold credit derivatives ratings/maturity profile - from 1-5 years	(516,569)	(347,577)
Protection sold credit derivatives ratings/maturity profile - more than 5 years	(193,729)	(35,421)
Total notional amount	(1,013,409)	(561,097)
Credit Derivatives, Protection Sold
Protection sold credit derivatives ratings/maturity profile
Fair value of receivables	9,256	6,482
Fair value of payables	(2,754)	(2,642)
Net fair value	6,502	3,840
Investment-grade
Protection sold credit derivatives ratings/maturity profile
Protection sold credit derivatives ratings/maturity profile - less than 1 year	(245,975)	(135,950)
Protection sold credit derivatives ratings/maturity profile - from 1-5 years	(391,797)	(277,052)
Protection sold credit derivatives ratings/maturity profile - more than 5 years	(141,841)	(33,379)
Total notional amount	(779,613)	(446,381)
Investment-grade | Credit Derivatives, Protection Sold
Protection sold credit derivatives ratings/maturity profile
Fair value of receivables	5,484	4,593
Fair value of payables	(913)	(904)
Net fair value	4,571	3,689
Noninvestment-grade
Protection sold credit derivatives ratings/maturity profile
Protection sold credit derivatives ratings/maturity profile - less than 1 year	(57,136)	(42,149)
Protection sold credit derivatives ratings/maturity profile - from 1-5 years	(124,772)	(70,525)
Protection sold credit derivatives ratings/maturity profile - more than 5 years	(51,888)	(2,042)
Total notional amount	(233,796)	(114,716)
Noninvestment-grade | Credit Derivatives, Protection Sold
Protection sold credit derivatives ratings/maturity profile
Fair value of receivables	3,772	1,889
Fair value of payables	(1,841)	(1,738)
Net fair value	$ 1,931	$ 151