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	785					785
Other comprehensive loss (income), net of tax	6						6
Dividends on common stock	(29)					(29)
Dividends on preferred stock	(600)					(600)
Issuance of common stock and other, net	141		1		140
Purchases of treasury stock	(3)			(3)
Ending balance at Sep. 30, 2021	18,873	9,762	217	(10,668)	16,692	3,152	(282)
Beginning balance at Jun. 30, 2021	18,244	9,762	217	(10,668)	16,638	2,533	(238)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	828					828
Other comprehensive loss (income), net of tax	(44)						(44)
Dividends on common stock	(9)					(9)
Dividends on preferred stock	(200)					(200)
Issuance of common stock and other, net	54				54
Ending balance at Sep. 30, 2021	18,873	9,762	217	(10,668)	16,692	3,152	(282)
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	11,377					11,377
Other comprehensive loss (income), net of tax	121						121
Dividends on common stock	(369)					(369)
Dividends on preferred stock	(600)					(600)
Shareholder warrants exercised	253		2		251
Options exercised	27				27
Issuance of common stock and other, net	103		1		102
Purchases of treasury stock	(2,519)			(2,519)
Ending balance at Sep. 30, 2022	28,720	9,762	220	(13,192)	17,129	14,888	(87)
Beginning balance at Jun. 30, 2022	27,830	9,762	218	(11,391)	16,914	12,462	(135)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	2,746					2,746
Other comprehensive loss (income), net of tax	48						48
Dividends on common stock	(120)					(120)
Dividends on preferred stock	(200)					(200)
Shareholder warrants exercised	163		1		162
Options exercised	10				10
Issuance of common stock and other, net	44		1		43
Purchases of treasury stock	(1,801)			(1,801)
Ending balance at Sep. 30, 2022	$ 28,720	$ 9,762	$ 220	$ (13,192)	$ 17,129	$ 14,888	$ (87)