STOCKHOLDERS' EQUITY - Preferred Stock Outstanding (Details) - USD ($)			12 Months Ended
	Jul. 06, 2021	Jun. 11, 2021	Dec. 31, 2021	Dec. 31, 2020
Class of Stock [Line Items]
Preferred stock, issued			$ 2,014,000,000	$ 1,965,000,000
Number of shares issued (in shares)			2,050,000	2,000,000
Preferred stock, par value (in dollars per share)			$ 25.00	$ 25.00
Redemption period			90 days
Redemption price per share (in dollars per share)			$ 1,000
Series A
Class of Stock [Line Items]
Preferred stock, issued			$ 0	$ 247,000,000
Number of shares issued (in shares)			0	250,000
Preferred stock, dividend rate	5.50%
Series B
Class of Stock [Line Items]
Preferred stock, issued			$ 296,000,000	$ 296,000,000
Number of shares issued (in shares)			300,000	300,000
Preferred stock, dividend rate			6.00%
Series C
Class of Stock [Line Items]
Preferred stock, issued			$ 297,000,000	$ 297,000,000
Number of shares issued (in shares)			300,000	300,000
Preferred stock, dividend rate			6.375%
Series D
Class of Stock [Line Items]
Preferred stock, issued			$ 293,000,000	$ 293,000,000
Number of shares issued (in shares)			300,000	300,000
Preferred stock, dividend rate			6.35%
Depositary shares issued (in shares)			12,000,000
Series E
Class of Stock [Line Items]
Preferred stock, issued			$ 437,000,000	$ 437,000,000
Number of shares issued (in shares)			450,000	450,000
Preferred stock, dividend rate			500.00%
Depositary shares issued (in shares)			18,000,000
Series F
Class of Stock [Line Items]
Preferred stock, issued			$ 395,000,000	$ 395,000,000
Number of shares issued (in shares)			400,000	400,000
Preferred stock, dividend rate			5.65%
Series G
Class of Stock [Line Items]
Preferred stock, issued		$ 300,000,000	$ 296,000,000	$ 0
Number of shares issued (in shares)		300,000	300,000	0
Preferred stock, dividend rate		4.00%
Preferred stock, par value (in dollars per share)			$ 25
Proceeds from stock issuance		$ 296,000,000
Redemption period		90 days
LIBOR | Series B
Class of Stock [Line Items]
Preferred stock, dividend payment rate			3.003%
LIBOR | Series C
Class of Stock [Line Items]
Preferred stock, dividend payment rate			3.157%
LIBOR | Series D
Class of Stock [Line Items]
Preferred stock, dividend payment rate			3.642%
US Treasury (UST) Interest Rate | Series F
Class of Stock [Line Items]
Preferred stock, dividend payment rate			5.313%
US Treasury (UST) Interest Rate | Series G
Class of Stock [Line Items]
Preferred stock, dividend payment rate			3.215%