Earnings Per Share And Stockholders' Equity (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Basic earnings (loss) per common share
Net income (loss)	$ (2,013)	$ 631
Less: Preferred stock dividends	(219)	0
NET INCOME (LOSS) ATTRIBUTABLE TO COMMON STOCKHOLDERS	(2,232)	631
Less: Net income allocated to participating securities	0	(3)
Net income (loss) attributable to common stock, net of participating securities	$ (2,232)	$ 628
Weighted average number of basic shares (in shares)	896.7	748.9
Basic earnings (loss) per common share (in usd per share)	$ (2.49)	$ 0.84
Weighted average number of basic shares (in shares)	896.7	748.9
Net income (loss) attributable to common stock, net of participating securities	$ (2,232)	$ 628
Dilutive securities (in shares)	0.0	1.6
Total diluted weighted average common shares (in shares)	896.7	750.5
Net income (loss) attributable to common stockholders per share—diluted (in usd per share)	$ (2.49)	$ 0.84