Derivative Instruments - Credit Derivatives, Protection Sold, Notional and Fair Value (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Protection sold credit derivatives ratings/maturity profile
Protection sold credit derivatives ratings/maturity profile - less than 1 year	$ (258,336)	$ (190,662)
Protection sold credit derivatives ratings/maturity profile - from 1-5 years	(466,108)	(405,320)
Protection sold credit derivatives ratings/maturity profile - more than 5 years	(194,144)	(32,148)
Total notional amount	(918,588)	(628,130)
Credit Derivatives, Protection Sold
Protection sold credit derivatives ratings/maturity profile
Fair value of receivables	7,912	8,408
Fair value of payables	(4,332)	(2,993)
Net fair value	3,580	5,415
Investment-grade
Protection sold credit derivatives ratings/maturity profile
Protection sold credit derivatives ratings/maturity profile - less than 1 year	(214,528)	(146,799)
Protection sold credit derivatives ratings/maturity profile - from 1-5 years	(331,370)	(314,100)
Protection sold credit derivatives ratings/maturity profile - more than 5 years	(141,320)	(28,117)
Total notional amount	(687,218)	(489,016)
Investment-grade | Credit Derivatives, Protection Sold
Protection sold credit derivatives ratings/maturity profile
Fair value of receivables	4,526	4,969
Fair value of payables	(1,432)	(908)
Net fair value	3,094	4,061
Noninvestment-grade
Protection sold credit derivatives ratings/maturity profile
Protection sold credit derivatives ratings/maturity profile - less than 1 year	(43,808)	(43,863)
Protection sold credit derivatives ratings/maturity profile - from 1-5 years	(134,738)	(91,220)
Protection sold credit derivatives ratings/maturity profile - more than 5 years	(52,824)	(4,031)
Total notional amount	(231,370)	(139,114)
Noninvestment-grade | Credit Derivatives, Protection Sold
Protection sold credit derivatives ratings/maturity profile
Fair value of receivables	3,386	3,439
Fair value of payables	(2,900)	(2,085)
Net fair value	$ 486	$ 1,354