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, 2021	$ 20,327	$ 9,762	$ 217	$ (10,673)	$ 16,749	$ 4,480	$ (208)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	4,876					4,876
Other comprehensive loss (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 of cancellations	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)
Beginning balance at Dec. 31, 2022	30,085	9,762	220	(13,772)	17,181	16,499	195
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,263					1,263
Other comprehensive loss (income), net of tax	60						60
Dividends on common stock	(164)					(164)
Dividends on preferred stock	(200)					(200)
Preferred stock redemption - face value	(647)	(647)
Preferred stock redemption - premium	(65)					(65)
Preferred stock redemption value in excess of carrying value	0	15				(15)
Shareholder warrants exercised	2		0		2
Options exercised	7				7
Issuance of common stock and other, net of cancellations	(30)		1		(31)
Purchases of treasury stock	(752)			(752)
Ending balance at Mar. 31, 2023	$ 29,559	$ 9,130	$ 221	$ (14,524)	$ 17,159	$ 17,318	$ 255