Shareholders' Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions		1 Months Ended	12 Months Ended
	Dec. 20, 2021	Sep. 30, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Class of Stock [Line Items]
Common stock dividends declared and paid			$ 3,500	$ 800	$ 400
Preferred stock dividends declared and paid			$ 59		45
Preferred stock par value (in dollars per share)			$ 0.01	$ 0.01
Proceeds from issuance of preferred stock			$ 0	$ 492	0
Amount set aside for preferred stock payments	$ 59
Series A
Class of Stock [Line Items]
Preferred stock dividends declared and paid	$ 29		$ 58	$ 58	58
Preferred stock dividends declared (in dollars per share)	$ 28.75
Preferred stock shares issued			1,000,000	1,000,000
Series B
Class of Stock [Line Items]
Preferred stock dividends declared and paid	$ 16		$ 32	$ 32	$ 33
Preferred stock dividends declared (in dollars per share)	$ 32.50
Preferred stock shares issued			500,000	500,000
Series C
Class of Stock [Line Items]
Preferred stock dividends declared and paid	$ 14		$ 30
Preferred stock dividends declared (in dollars per share)	$ 28.50
Preferred stock shares issued		500,000	500,000	500,000
Preferred stock par value (in dollars per share)		$ 0.01
Liquidation preference (in dollars per share)		$ 1,000
Proceeds from issuance of preferred stock		$ 492
Preferred stock dividend rate		5.70%
Series C | US Treasury Interest Rate
Class of Stock [Line Items]
Variable dividend payment rate		4.997%