PREFERRED STOCK - Schedule of Preferred Stock Outstanding (Details) - USD ($) $ / shares in Units, $ in Millions	9 Months Ended
	Sep. 30, 2024	Dec. 31, 2023
Class of Stock [Line Items]
Carrying value	$ 16,350	$ 17,600
Series D
Class of Stock [Line Items]
Redemption price per depositary share/ preference share (in dollars per share)	$ 1,000
Number of depositary shares (in shares)	1,250,000
Carrying value	$ 0	1,250
Series J
Class of Stock [Line Items]
Redemption price per depositary share/ preference share (in dollars per share)	$ 25
Number of depositary shares (in shares)	22,000,000
Carrying value	$ 0	550
Series M
Class of Stock [Line Items]
Redemption price per depositary share/ preference share (in dollars per share)	$ 1,000
Number of depositary shares (in shares)	1,750,000
Carrying value	$ 0	1,750
Series P
Class of Stock [Line Items]
Dividend rate (as a percent)	5.95%
Redemption price per depositary share/ preference share (in dollars per share)	$ 1,000
Number of depositary shares (in shares)	2,000,000
Carrying value	$ 2,000	2,000
Percentage of interest in corresponding series of preferred stock	4.00%
Series T
Class of Stock [Line Items]
Dividend rate (as a percent)	6.25%
Redemption price per depositary share/ preference share (in dollars per share)	$ 1,000
Number of depositary shares (in shares)	1,500,000
Carrying value	$ 1,500	1,500
Percentage of interest in corresponding series of preferred stock	4.00%
Series U
Class of Stock [Line Items]
Redemption price per depositary share/ preference share (in dollars per share)	$ 1,000
Number of depositary shares (in shares)	1,500,000
Carrying value	$ 0	1,500
Series V
Class of Stock [Line Items]
Dividend rate (as a percent)	4.70%
Redemption price per depositary share/ preference share (in dollars per share)	$ 1,000
Number of depositary shares (in shares)	1,500,000
Carrying value	$ 1,500	1,500
Percentage of interest in corresponding series of preferred stock	4.00%
Series W
Class of Stock [Line Items]
Dividend rate (as a percent)	4.00%
Redemption price per depositary share/ preference share (in dollars per share)	$ 1,000
Number of depositary shares (in shares)	1,500,000
Carrying value	$ 1,500	1,500
Percentage of interest in corresponding series of preferred stock	4.00%
Series W | US Treasury (UST) Interest Rate
Class of Stock [Line Items]
Dividend rate (as a percent)	3.597%
Series X
Class of Stock [Line Items]
Dividend rate (as a percent)	3.875%
Redemption price per depositary share/ preference share (in dollars per share)	$ 1,000
Number of depositary shares (in shares)	2,300,000
Carrying value	$ 2,300	2,300
Percentage of interest in corresponding series of preferred stock	4.00%
Series X | US Treasury (UST) Interest Rate
Class of Stock [Line Items]
Dividend rate (as a percent)	3.417%
Series Y
Class of Stock [Line Items]
Dividend rate (as a percent)	4.15%
Redemption price per depositary share/ preference share (in dollars per share)	$ 1,000
Number of depositary shares (in shares)	1,000,000
Carrying value	$ 1,000	1,000
Percentage of interest in corresponding series of preferred stock	4.00%
Series Y | US Treasury (UST) Interest Rate
Class of Stock [Line Items]
Dividend rate (as a percent)	3.00%
Series Z
Class of Stock [Line Items]
Dividend rate (as a percent)	7.375%
Redemption price per depositary share/ preference share (in dollars per share)	$ 1,000
Number of depositary shares (in shares)	1,250,000
Carrying value	$ 1,250	1,250
Percentage of interest in corresponding series of preferred stock	4.00%
Series Z | US Treasury (UST) Interest Rate
Class of Stock [Line Items]
Dividend rate (as a percent)	3.209%
Series AA
Class of Stock [Line Items]
Dividend rate (as a percent)	7.625%
Redemption price per depositary share/ preference share (in dollars per share)	$ 1,000
Number of depositary shares (in shares)	1,500,000
Carrying value	$ 1,500	1,500
Percentage of interest in corresponding series of preferred stock	4.00%
Series AA | US Treasury (UST) Interest Rate
Class of Stock [Line Items]
Dividend rate (as a percent)	3.211%
Series BB
Class of Stock [Line Items]
Dividend rate (as a percent)	7.20%
Redemption price per depositary share/ preference share (in dollars per share)	$ 1,000
Number of depositary shares (in shares)	550,000
Carrying value	$ 550	0
Percentage of interest in corresponding series of preferred stock	4.00%
Series BB | US Treasury (UST) Interest Rate
Class of Stock [Line Items]
Dividend rate (as a percent)	2.905%
Series CC
Class of Stock [Line Items]
Dividend rate (as a percent)	7.125%
Redemption price per depositary share/ preference share (in dollars per share)	$ 1,000
Number of depositary shares (in shares)	1,750,000
Carrying value	$ 1,750	0
Series CC | US Treasury (UST) Interest Rate
Class of Stock [Line Items]
Dividend rate (as a percent)	2.693%
Series DD
Class of Stock [Line Items]
Dividend rate (as a percent)	7.00%
Redemption price per depositary share/ preference share (in dollars per share)	$ 1,000
Number of depositary shares (in shares)	1,500,000
Carrying value	$ 1,500	$ 0
Percentage of interest in corresponding series of preferred stock	4.00%
Series DD | US Treasury (UST) Interest Rate
Class of Stock [Line Items]
Dividend rate (as a percent)	2.757%