EQUITY (Details - Preferred Stock) - USD ($) $ / shares in Units, $ in Millions										9 Months Ended
	Sep. 30, 2019	Sep. 16, 2019	Jun. 28, 2019	Jun. 17, 2019	Mar. 29, 2019	Mar. 14, 2019	Sep. 28, 2018	Jun. 28, 2018	Mar. 29, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Class of Stock [Line Items]
Issuances (in shares)										3,339,817
Preferred stock, par value (in dollars per share)	$ 5.00									$ 5.00		$ 0
Preferred stock liquidation preference	$ 500									$ 500		$ 0
Issuance of preferred stock										$ 485	$ 0
Date dividends declared	Aug. 07, 2019		May 06, 2019		Feb. 13, 2019		Aug. 02, 2018	May 02, 2018	Feb. 08, 2018
Date dividends paid	Sep. 30, 2019		Jun. 28, 2019		Mar. 29, 2019		Sep. 28, 2018	Jun. 28, 2018	Mar. 29, 2018
Date of record	Sep. 17, 2019		Jun. 14, 2019		Mar. 15, 2019		Sep. 17, 2018	Jun. 14, 2018	Mar. 15, 2018
Series A Preferred Stock
Class of Stock [Line Items]
Issuances (in shares)						20,000
Preferred stock, dividend rate (as a percent)						5.85%				5.85%
Preferred stock, par value (in dollars per share)						$ 5.00
Preferred stock liquidation preference						$ 25,000
Issuance of preferred stock						$ 485
Date dividends declared		Aug. 07, 2019		May 21, 2019
Preferred Stock Dividends Per Share Cash Paid		$ 365.625		$ 369.6875
Date dividends paid		Sep. 16, 2019		Jun. 17, 2019
Date of record		Aug. 30, 2019		May 31, 2019
Series A Preferred Stock | Rating Agency Event [Member]
Class of Stock [Line Items]
Preferred stock redemption terms										90 days
Preferred stock redemption price per share						$ 25,500
Series A Preferred Stock | Regulatory Capital Event [Member]
Class of Stock [Line Items]
Preferred stock redemption terms										90 days
Preferred stock redemption price per share						$ 25,000
Depositary Shares
Class of Stock [Line Items]
Issuances (in shares)						20,000,000
Preferred stock liquidation preference						$ 25.00
Preferred Stock Dividends Per Share Cash Paid		$ 0.365625		$ 0.3696875
Depositary Shares | Rating Agency Event [Member]
Class of Stock [Line Items]
Preferred stock redemption price per share						25.50
Depositary Shares | Regulatory Capital Event [Member]
Class of Stock [Line Items]
Preferred stock redemption price per share						$ 25.00