Shareholders' Equity - Preferred shares (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	1 Months Ended			4 Months Ended
	Jun. 30, 2021	Nov. 30, 2017	Aug. 31, 2017	Nov. 30, 2017	Dec. 31, 2024	Jun. 30, 2022
Class of Stock [Line Items]
Preferred shares, par value per share					$ 0.01
Series F Preferred Shares
Class of Stock [Line Items]
Preferred shares issued		$ 100	$ 230	$ 330
Preferred shares, dividend rate (as a percent)				5.45%
Preferred shares, par value per share		$ 0.01		$ 0.01
Liquidation preference per share		25,000		25,000
Preferred shares, redemption price per share		$ 25,000		$ 25,000
Series F depositary share equivalent
Class of Stock [Line Items]
Preference shares, number of shares issued		13.2		13.2
Proportionate interest of preference shares, per depositary share		0.10%		0.10%
Liquidation preference per share		$ 25		$ 25
Preferred shares, redemption price per share		$ 25		$ 25
Series G Preferred Stock
Class of Stock [Line Items]
Preferred shares issued	$ 500
Preferred shares, dividend rate (as a percent)	4.55%
Preferred shares, par value per share	$ 0.01
Liquidation preference per share	25,000
Preferred shares, redemption price per share	$ 25,000
Series G depositary share equivalent
Class of Stock [Line Items]
Preference shares, number of shares issued	20.0
Proportionate interest of preference shares, per depositary share						0.10%
Liquidation preference per share	$ 25
Preferred shares, redemption price per share	$ 25