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)	(43)					(43)
Other comprehensive loss (income), net of tax	50						50
Dividends on common stock	(20)					(20)
Dividends on preferred stock	(400)					(400)
Shareholder warrants exercised	4				4
Issuance of common stock and other, net	83		1		82
Purchases of treasury stock	(3)			(3)
Ending balance at Jun. 30, 2021	18,244	9,762	217	(10,668)	16,638	2,533	(238)
Beginning balance at Mar. 31, 2021	18,300	9,762	217	(10,668)	16,585	2,639	(235)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	103					103
Other comprehensive loss (income), net of tax	(3)						(3)
Dividends on common stock	(9)					(9)
Dividends on preferred stock	(200)					(200)
Shareholder warrants exercised	1				1
Issuance of common stock and other, net	52				52
Ending balance at Jun. 30, 2021	18,244	9,762	217	(10,668)	16,638	2,533	(238)
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)	8,631					8,631
Other comprehensive loss (income), net of tax	73						73
Dividends on common stock	(249)					(249)
Dividends on preferred stock	(400)					(400)
Shareholder warrants exercised	90		1		89
Options exercised	17				17
Issuance of common stock and other, net	59				59
Purchases of treasury stock	(718)			(718)
Ending balance at Jun. 30, 2022	27,830	9,762	218	(11,391)	16,914	12,462	(135)
Beginning balance at Mar. 31, 2022	24,907	9,762	217	(10,709)	16,785	9,032	(180)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	3,755					3,755
Other comprehensive loss (income), net of tax	45						45
Dividends on common stock	(125)					(125)
Dividends on preferred stock	(200)					(200)
Shareholder warrants exercised	70		1		69
Options exercised	10				10
Issuance of common stock and other, net	50				50
Purchases of treasury stock	(682)			(682)
Ending balance at Jun. 30, 2022	$ 27,830	$ 9,762	$ 218	$ (11,391)	$ 16,914	$ 12,462	$ (135)