Total Equity and Other Comprehensive Income (Dividends per Share) (Details) - $ / shares			3 Months Ended		6 Months Ended
	Sep. 01, 2020	Aug. 05, 2020	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Subsequent Event
Class of Stock [Line Items]
Cash dividends declared, Preferred, per share (in dollars per share)	$ 0.3359375
Common Stock, par value $5.00
Class of Stock [Line Items]
Cash dividends declared, Common, per share (in dollars per share)			$ 1.15	$ 0.95	$ 2.30	$ 1.90
Common Stock, par value $5.00 | Subsequent Event
Class of Stock [Line Items]
Cash dividends declared, Common, per share (in dollars per share)		$ 1.15
Series B Preferred Stock
Class of Stock [Line Items]
Cash dividends declared, Preferred, per share (in dollars per share)			0.45	0.45	0.90	0.90
Series O Preferred Stock
Class of Stock [Line Items]
Cash dividends declared, Preferred, per share (in dollars per share)					3,375	3,375
Series P Preferred Stock
Class of Stock [Line Items]
Cash dividends declared, Preferred, per share (in dollars per share)			1,532	1,532	3,063	3,063
Series Q Preferred Stock
Class of Stock [Line Items]
Cash dividends declared, Preferred, per share (in dollars per share)			1,344	1,344	2,688	2,688
Series R Preferred Stock
Class of Stock [Line Items]
Cash dividends declared, Preferred, per share (in dollars per share)			2,425	2,425	2,425	2,425
Series S Preferred Stock
Class of Stock [Line Items]
Cash dividends declared, Preferred, per share (in dollars per share)			$ 2,500	$ 2,500	$ 2,500	$ 2,500