STOCKHOLDERS' EQUITY - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions		1 Months Ended
	Jul. 31, 2025	Sep. 30, 2025	Dec. 31, 2024
Class of Stock [Line Items]
Preferred stock, value, issued		$ 2,111	$ 2,113
Preferred stock, issued (in shares)		2,150,000	2,150,000
Preferred stock, par value (in dollars per share)		$ 25.00	$ 25.00
Series I
Class of Stock [Line Items]
Preferred stock, value, issued	$ 400	$ 393	$ 0
Preferred stock, issued (in shares)	400,000	400,000	0
Preferred stock, dividend rate	6.50%
Preferred stock, par value (in dollars per share)	$ 25
Preferred stock, liquidation preference per share (in dollars per share)	$ 1,000	$ 1,000
Proceeds from issuance of stock	$ 393
Redemption option regulatory capital treatment event window	90 days
Series F
Class of Stock [Line Items]
Preferred stock, value, issued		$ 0	$ 395
Preferred stock, issued (in shares)		0	400,000
Preferred stock, dividend rate		5.65%
Preferred stock, liquidation preference per share (in dollars per share)		$ 1,000