Total Equity and Other Comprehensive Income (Dividends per Share) (Details) - $ / shares		3 Months Ended		9 Months Ended
	Nov. 05, 2020	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Common Stock, par value $5.00
Class of Stock [Line Items]
Cash dividends declared, Common, per share (in dollars per share)		$ 1.15	$ 1.15	$ 3.45	$ 3.05
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	1.35	1.35
Series O Preferred Stock
Class of Stock [Line Items]
Cash dividends declared, Preferred, per share (in dollars per share)		3,375	3,375	6,750	6,750
Series P Preferred Stock
Class of Stock [Line Items]
Cash dividends declared, Preferred, per share (in dollars per share)		1,531	1,531	4,594	4,594
Series Q Preferred Stock
Class of Stock [Line Items]
Cash dividends declared, Preferred, per share (in dollars per share)		$ 1,343	1,343	4,031	4,031
Series R Preferred Stock
Class of Stock [Line Items]
Cash dividends declared, Preferred, per share (in dollars per share)				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