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Shareholders' Equity (Preferred Shares) (Narrative) (Details)										3 Months Ended		9 Months Ended		12 Months Ended
	Aug. 17, 2021 USD ($) $ / shares shares	Jul. 20, 2021	Jun. 30, 2021	Jun. 16, 2021 USD ($) $ / shares shares	Jan. 20, 2021	Sep. 30, 2020	Aug. 14, 2020 USD ($) $ / shares shares	Jul. 10, 2020	Jun. 17, 2020 USD ($) $ / shares shares	Sep. 30, 2021 USD ($) $ / shares	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) dividend boardMember $ / shares	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Class of Stock [Line Items]
Number of quarterly dividends in arrearage before preferred shareholders can elect additional board members | dividend												6
Number of additional board members the preferred shareholders can elect in the case of an excess arrearage of quarterly dividends | boardMember												2
Amount of preferred dividends in arrears												$ 0
Affirmative vote of outstanding shares of a series of Preferred Shares required for any material and adverse amendment to the terms of series, percent												66.67%
Affirmative vote of outstanding shares of all Preferred Shares, voting as a single class, required to issue shares ranking senior to Preferred Shares, percent												66.67%
Redemption price per share (in USD per share) | $ / shares										$ 25.00		$ 25.00
Liquidation value (at par)										$ 4,015,000,000		$ 4,015,000,000		$ 3,792,500,000
EITF D-42 allocations										0	$ 23,313,000	$ 16,989,000	$ 38,382,000
Series B Preferred Stock
Class of Stock [Line Items]
Dividend rate percentage					5.40%
Liquidation value (at par)														300,000,000
EITF D-42 allocations														9,900,000
Series P Preferred Stock
Class of Stock [Line Items]
Dividend rate percentage				4.00%								4.00%
Liquidation value (at par)				$ 603,800,000						603,750,000		$ 603,750,000
Shares issued (in shares) | shares				24,200,000
Preferred shares per depositary share (in shares) | shares				0.001
Shares issued, price per share (in USD per share) | $ / shares				$ 25.00
Original issuance costs on preferred shares issued during the period				$ 17,400,000
Series C Preferred Stock
Class of Stock [Line Items]
Dividend rate percentage			5.125%									5.125%
Liquidation value (at par)														200,000,000
EITF D-42 allocations												$ 6,400,000
Series D Preferred Stock
Class of Stock [Line Items]
Dividend rate percentage		4.95%										4.95%
Liquidation value (at par)														325,000,000
EITF D-42 allocations												$ 10,600,000
Series L Preferred Stock
Class of Stock [Line Items]
Dividend rate percentage									4.625%			4.625%
Liquidation value (at par)									$ 565,000,000	565,000,000		$ 565,000,000		565,000,000
Shares issued (in shares) | shares									22,600,000
Preferred shares per depositary share (in shares) | shares									0.001
Shares issued, price per share (in USD per share) | $ / shares									$ 25.00
Original issuance costs on preferred shares issued during the period									$ 15,800,000
Series V Preferred Stock
Class of Stock [Line Items]
Dividend rate percentage								5.375%
EITF D-42 allocations													15,100,000
Series M Preferred Stock
Class of Stock [Line Items]
Dividend rate percentage							4.125%					4.125%
Liquidation value (at par)							$ 230,000,000			230,000,000		$ 230,000,000		$ 230,000,000
Shares issued (in shares) | shares							9,200,000
Preferred shares per depositary share (in shares) | shares							0.001
Shares issued, price per share (in USD per share) | $ / shares							$ 25.00
Original issuance costs on preferred shares issued during the period							$ 5,400,000
Series W and X Preferred Stock
Class of Stock [Line Items]
Dividend rate percentage						5.20%
EITF D-42 allocations											$ 23,300,000		$ 23,300,000
Series Q Preferred Stock
Class of Stock [Line Items]
Dividend rate percentage	3.95%											3.95%
Liquidation value (at par)	$ 143,800,000									$ 143,750,000		$ 143,750,000
Shares issued (in shares) | shares	5,800,000
Preferred shares per depositary share (in shares) | shares	0.001
Shares issued, price per share (in USD per share) | $ / shares	$ 25.00
Original issuance costs on preferred shares issued during the period	$ 4,800,000

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