Shareholders' Equity - Preferred Stock Dividends Declared (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Class of Stock [Line Items]
Dividends on preferred stock	$ 36	$ 36	$ 28
Series A Preferred Stock
Class of Stock [Line Items]
Preferred stock, dividends paid (in dollars per share)	$ 61.25	$ 61.25	$ 61.76
Dividends on preferred stock	$ 20	$ 20	$ 20
Series B Preferred Stock
Class of Stock [Line Items]
Preferred stock, dividends paid (in dollars per share)	$ 53.50	$ 53.50	$ 26.30
Dividends on preferred stock	$ 16	$ 16	$ 8