STOCKHOLDERS' EQUITY - Preferred Stock Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	Jun. 04, 2020	Jun. 30, 2020	Dec. 31, 2019
Class of Stock [Line Items]
Preferred stock, par value (in dollars per share)		$ 25.00	$ 25.00
Series F Preferred Stock
Class of Stock [Line Items]
Preferred stock, dividend rate	5.65%
Preferred stock, par value (in dollars per share)	$ 25.00
Preferred stock, liquidation preference per share (in dollars per share)	$ 1,000	$ 1,000
Redemption notice period	90 days
Redemption price per share (usd per share)	$ 1,000
US Treasury (UST) Interest Rate, Five-Year | Series F Preferred Stock
Class of Stock [Line Items]
Preferred stock, dividend payment rate, basis spread on variable rate	5.313%
Series F Preferred Stock | Series F Preferred Stock
Class of Stock [Line Items]
Preferred stock issued	$ 400
Preferred stock issued (in shares)	400,000
Proceeds from issuance of stock	$ 395