Subsequent Events (Narrative) (Details) - USD ($)		3 Months Ended		6 Months Ended
	Sep. 01, 2020	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Subsequent Event
Subsequent Event [Line Items]
Preferred stock, redemption price per share (in dollars per share)	$ 25.00
Cash dividends declared, Preferred, per share (in dollars per share)	$ 0.3359375
Series Q Preferred Stock
Subsequent Event [Line Items]
Cash dividends declared, Preferred, per share (in dollars per share)		$ 1,344	$ 1,344	$ 2,688	$ 2,688
Series Q Preferred Stock | Subsequent Event
Subsequent Event [Line Items]
Preferred stock, dividend rate, percentage	5.375%
Depositary share representing interest in a share of preferred stock, percentage	0.025%
Depositary Shares [Member] | Subsequent Event
Subsequent Event [Line Items]
Preferred stock, redemption amount	$ 480,000,000
Shares, outstanding (in shares)	19,200,000