CONDENSED STATEMENTS OF CONSOLIDATED CHANGES IN EQUITY (Parentheticals) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Class of Stock [Line Items]
Cumulative preferred stock shares authorized (in shares)	20,000,000	20,000,000	20,000,000	20,000,000
Common stock shares par value (in dollars per share)	$ 0.01	$ 0.01	$ 0.01	$ 0.01	$ 0.01
Common stock shares authorized (in shares)	1,000,000,000	1,000,000,000	1,000,000,000	1,000,000,000	1,000,000,000
Common stock dividends declared per share	$ 0.1500	$ 0.2875	$ 0.4400	$ 0.2875
Series A Preferred Stock [Member]
Class of Stock [Line Items]
Cumulative preferred stock par value (in dollars per share)	0.01	0.01	0.01	0.01	$ 0.01
Preferred stock dividends declared	0.0000		30.6250
Series B Preferred Stock [Member]
Class of Stock [Line Items]
Cumulative preferred stock par value (in dollars per share)	0.01	0.01	0.01	0.01	$ 0.01
Preferred stock dividends declared	17.5000	$ 17.5000	35.0000	$ 17.5000
Series C Preferred Stock [Member]
Class of Stock [Line Items]
Cumulative preferred stock par value (in dollars per share)	0.01		0.01
Preferred stock dividends declared	$ 0.1500		$ 0.1500