CONSOLIDATED CONDENSED STATEMENTS OF EQUITY - USD ($) $ in Millions	Total	Preferred Stock	Common Stock	Treasury Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Beginning balance at Dec. 31, 2020	$ 18,573	$ 9,762	$ 216	$ (10,665)	$ 16,552	$ 2,996	$ (288)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(146)					(146)
Other comprehensive income, net of tax	53						53
Dividends on common stock	(11)					(11)
Dividends on preferred stock	(200)					(200)
Shareholder warrants exercised	3				3
Issuance of common stock and other, net	31		1		30
Purchases of treasury stock	(3)			(3)
Ending balance at Mar. 31, 2021	18,300	9,762	217	(10,668)	16,585	2,639	(235)
Beginning balance at Dec. 31, 2021	20,327	9,762	217	(10,673)	16,749	4,480	(208)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	4,876					4,876
Other comprehensive income, net of tax	28						28
Dividends on common stock	(124)					(124)
Dividends on preferred stock	(200)					(200)
Shareholder warrants exercised	20				20
Options exercised	7				7
Issuance of common stock and other, net	9				9
Purchases of treasury stock	(36)			(36)
Ending balance at Mar. 31, 2022	$ 24,907	$ 9,762	$ 217	$ (10,709)	$ 16,785	$ 9,032	$ (180)