Earnings Per Share and Stockholders' Equity (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Basic earnings (loss) per common share
Net income from continuing operations	$ 4,876	$ 299
Loss from discontinued operations	0	(445)
NET INCOME (LOSS)	4,876	(146)
Less: Preferred stock dividends	(200)	(200)
NET INCOME (LOSS) ATTRIBUTABLE TO COMMON STOCKHOLDERS	4,676	(346)
Less: Net income allocated to participating securities	(34)	0
Net income (loss), net of participating securities	$ 4,642	$ (346)
Weighted-average number of basic shares (in shares)	936.7	933.1
Basic loss per common share (in usd per share)	$ 4.96	$ (0.37)
Diluted shares (in shares)	997.7	947.9
Diluted loss per common share (in usd per share)	$ 4.65	$ (0.36)