DERIVATIVES - Credit Derivatives (Details) $ in Millions	3 Months Ended
	Mar. 31, 2025 USD ($) agency	Dec. 31, 2024 USD ($)
Credit Risk Derivatives
Fair values, receivable	$ 9,052.0	$ 8,715.0
Fair values, payable	8,219.0	7,253.0
Notionals, protection purchased	626,695.0	531,429.0
Notionals, protection sold	533,380.0	439,146.0
Fair value of derivative in liability position	13,000.0	15,000.0
Fair value of collateral already posted	$ 11,000.0	13,000.0
Number of rating agencies | agency	3
Additional collateral to be posted	$ 200.0
Collateral to be segregated	9.0
Aggregate cash obligations and collateral requirements	200.0
Fair value gross derivative assets	304,560.0	334,900.0
Purchased
Credit Risk Derivatives
Fair values, receivable	3,788.0	3,864.0
Fair values, payable	6,249.0	5,403.0
Sold
Credit Risk Derivatives
Fair values, receivable	5,264.0	4,851.0
Fair values, payable	1,970.0	1,850.0
Within 1 year
Credit Risk Derivatives
Fair values, receivable	1,032.0	1,606.0
Fair values, payable	1,340.0	1,166.0
Notionals, protection purchased	158,726.0	140,541.0
Notionals, protection sold	144,474.0	118,885.0
From 1 to 5 years
Credit Risk Derivatives
Fair values, receivable	5,795.0	5,625.0
Fair values, payable	5,242.0	4,906.0
Notionals, protection purchased	371,428.0	342,608.0
Notionals, protection sold	309,060.0	295,503.0
After 5 years
Credit Risk Derivatives
Fair values, receivable	2,225.0	1,484.0
Fair values, payable	1,637.0	1,181.0
Notionals, protection purchased	96,541.0	48,280.0
Notionals, protection sold	79,846.0	24,758.0
Investment grade
Credit Risk Derivatives
Fair values, receivable	4,052.0	4,578.0
Fair values, payable	3,730.0	3,450.0
Notionals, protection purchased	415,533.0	405,271.0
Notionals, protection sold	355,050.0	350,124.0
Non-investment grade
Credit Risk Derivatives
Fair values, receivable	5,000.0	4,137.0
Fair values, payable	4,489.0	3,803.0
Notionals, protection purchased	211,162.0	126,158.0
Notionals, protection sold	178,330.0	89,022.0
Credit default swaps and options
Credit Risk Derivatives
Fair values, receivable	7,343.0	6,765.0
Fair values, payable	7,317.0	6,545.0
Notionals, protection purchased	574,949.0	486,901.0
Notionals, protection sold	522,262.0	431,005.0
Total return swaps and other
Credit Risk Derivatives
Fair values, receivable	1,709.0	1,950.0
Fair values, payable	902.0	708.0
Notionals, protection purchased	51,746.0	44,528.0
Notionals, protection sold	11,118.0	8,141.0
Interest rate swaps
Credit Risk Derivatives
Cash proceeds received for assets derecognized	6,000.0	6,200.0
Fair value of derecognized assets	5,500.0	5,800.0
Fair value gross derivative assets	106.1	179.0
Trading derivatives, liability	$ 182.3	$ 29.0