Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($) $ in Millions	Total	Preferred Shares	Common Shares	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings	Series D Preferred Stock	Series D Preferred Stock Retained Earnings
Beginning Balance at Dec. 31, 2022	$ 24,711	$ 0	$ 149	$ 11,493	$ (3,210)	$ 16,279
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	3,990					3,990
Other comprehensive income (loss)	126				126	0
Repurchase of common shares	(1,312)		(1)	(123)		(1,188)
Other changes, including employee plans	112			139		(27)
Cash dividends declared preferred							$ (29)	$ (29)
Cash dividends declared common	(895)					(895)
Ending Balance at Jun. 30, 2023	26,703	0	148	11,509	(3,084)	18,130
Beginning Balance at Mar. 31, 2023	25,992	0	149	11,522	(3,106)	17,427
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	2,174					2,174
Other comprehensive income (loss)	22				22	0
Repurchase of common shares	(1,117)		(1)	(106)		(1,010)
Other changes, including employee plans	92			93		(1)
Cash dividends declared preferred							(15)	(15)
Cash dividends declared common	(445)					(445)
Ending Balance at Jun. 30, 2023	26,703	0	148	11,509	(3,084)	18,130
Beginning Balance at Dec. 31, 2023	28,057	0	145	11,372	(3,072)	19,612
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	5,452					5,452
Other comprehensive income (loss)	(128)				(128)	0
Repurchase of common shares	(2,903)		(2)	(200)		(2,701)
Other changes, including employee plans	101			160		(59)
Cash dividends declared preferred							(29)	(29)
Cash dividends declared common	(1,010)					(1,010)
Ending Balance at Jun. 30, 2024	29,540	0	143	11,332	(3,200)	21,265
Beginning Balance at Mar. 31, 2024	28,764	0	144	11,354	(3,155)	20,421
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	3,015					3,015
Other comprehensive income (loss)	(45)				(45)	0
Repurchase of common shares	(1,767)		(1)	(117)		(1,649)
Other changes, including employee plans	91			95		(4)
Cash dividends declared preferred							$ (15)	$ (15)
Cash dividends declared common	(503)					(503)
Ending Balance at Jun. 30, 2024	$ 29,540	$ 0	$ 143	$ 11,332	$ (3,200)	$ 21,265