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SHAREHOLDERS' EQUITY (Dividends) (Details) - $ / shares	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Class of Stock [Line Items]
Cash dividends declared per common share (in usd per share)	$ 0.42	$ 0.41
Dividends paid in period of declaration (in usd per share)	0	0
Dividends paid in period following declaration (in usd per share)	0.42	0.41
Series E preferred shares
Class of Stock [Line Items]
Cash dividends declared per preferred share (in usd per share)	34.38	34.38
Dividends paid in period of declaration (in usd per share)	0	0
Dividends paid in period following declaration (in usd per share)	$ 34.38	$ 34.38

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770

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