Common and Preferred Stock - Dividends (Details) - USD ($) $ / shares in Units, $ in Millions							12 Months Ended
	Dec. 22, 2021	Sep. 23, 2021	Jun. 23, 2021	Mar. 25, 2021	Apr. 09, 2020	Apr. 10, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Equity [Abstract]
Amount per share (in dollars per share)	$ 1.00	$ 1.00	$ 1.00	$ 1.00	$ 0.04	$ 0.04
Total amount paid	$ 324	$ 330	$ 342	$ 345	$ 15	$ 15	$ 1,347	$ 15	$ 15