SHAREHOLDERS' EQUITY (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Class of Stock [Line Items]
Shares outstanding (in shares)	891,900		885,000
Carrying Amount	$ 2,881		$ 2,731
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) [Member]
Amount	$ 41	$ 27
Retained Earnings
Class of Stock [Line Items]
Amount	$ 41	$ 27
Series B
Class of Stock [Line Items]
Shares outstanding (in shares)	35,500
Carrying Amount	$ 24		24
Preferred stock, basis spread adjustment on variable rate	0.26%
Preferred stock, variable rate basis spread	2.70%
Cash dividend declared per share (in usd per share)	$ 16.58	$ 18.16
Series B | Retained Earnings
Class of Stock [Line Items]
Amount	$ 1	$ 1
Series F
Class of Stock [Line Items]
Shares outstanding (in shares)	5,000
Dividend Rate	5.625%
Carrying Amount	$ 494		494
Cash dividend declared per share (in usd per share)	$ 1,406.25	$ 1,406.25
Series F | Retained Earnings
Class of Stock [Line Items]
Amount	$ 7	$ 6
Series G
Class of Stock [Line Items]
Shares outstanding (in shares)	5,000
Dividend Rate	4.45%
Carrying Amount	$ 494		494
Cash dividend declared per share (in usd per share)	$ 1,112.5	$ 1,112.5
Series G | Retained Earnings
Class of Stock [Line Items]
Amount	$ 6	$ 6
Series H
Class of Stock [Line Items]
Shares outstanding (in shares)	500,000
Dividend Rate	4.50%
Carrying Amount	$ 486		486
Cash dividend declared per share (in usd per share)	$ 11.25	$ 11.25
Series H | Retained Earnings
Class of Stock [Line Items]
Amount	$ 6	$ 6
Series I
Class of Stock [Line Items]
Shares outstanding (in shares)	7,000
Dividend Rate	5.70%
Carrying Amount	$ 175		175
Redemption price (per share)	$ 25,000
Cash dividend declared per share (in usd per share)	$ 356.25	$ 356.25
Series I | Retained Earnings
Class of Stock [Line Items]
Amount	$ 2	$ 2
Series J
Class of Stock [Line Items]
Shares outstanding (in shares)	325,000
Dividend Rate	6.875%
Carrying Amount	$ 317		317
Cash dividend declared per share (in usd per share)	$ 17.19	$ 17.19
Series J | Retained Earnings
Class of Stock [Line Items]
Amount	$ 6	$ 6
Series K
Class of Stock [Line Items]
Shares outstanding (in shares)	7,500
Dividend Rate	6.25%
Carrying Amount	$ 741		741
Cash dividend declared per share (in usd per share)	$ 1,562.5
Series K | Retained Earnings
Class of Stock [Line Items]
Amount	$ 11
Series L
Class of Stock [Line Items]
Shares outstanding (in shares)	6,900
Dividend Rate	5.50%
Carrying Amount	$ 150		$ 0
Cash dividend declared per share (in usd per share)	$ 343.75
Series L | Retained Earnings
Class of Stock [Line Items]
Amount	$ 2
Series B, H and J Preferred Stock
Class of Stock [Line Items]
Redemption price (per share)	$ 1,000
Series F and G Preferred Stock
Class of Stock [Line Items]
Redemption price (per share)	$ 100,000