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	6,441					6,441
Other comprehensive income (loss)	34				34	0
Repurchase of common shares	(2,611)		(3)	(246)		(2,362)
Other changes, including employee plans	126			154		(28)
Cash dividends declared preferred							$ (43)	$ (43)
Cash dividends declared common	(1,334)					(1,334)
Ending Balance at Sep. 30, 2023	27,324	0	146	11,401	(3,176)	18,953
Beginning Balance at Jun. 30, 2023	26,703	0	148	11,509	(3,084)	18,130
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	2,451					2,451
Other comprehensive income (loss)	(92)				(92)	0
Repurchase of common shares	(1,299)		(2)	(123)		(1,174)
Other changes, including employee plans	14			15		(1)
Cash dividends declared preferred							(14)	(14)
Cash dividends declared common	(439)					(439)
Ending Balance at Sep. 30, 2023	27,324	0	146	11,401	(3,176)	18,953
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	7,959					7,959
Other comprehensive income (loss)	(123)				(123)	0
Repurchase of common shares	(4,822)		(4)	(321)		(4,497)
Other changes, including employee plans	184			244		(60)
Cash dividends declared preferred							(44)	(44)
Cash dividends declared common	(1,504)					(1,504)
Ending Balance at Sep. 30, 2024	29,707	0	141	11,295	(3,195)	21,466
Beginning Balance at Jun. 30, 2024	29,540	0	143	11,332	(3,200)	21,265
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	2,507					2,507
Other comprehensive income (loss)	5				5	0
Repurchase of common shares	(1,919)		(2)	(121)		(1,796)
Other changes, including employee plans	83			84		(1)
Cash dividends declared preferred							$ (15)	$ (15)
Cash dividends declared common	(494)					(494)
Ending Balance at Sep. 30, 2024	$ 29,707	$ 0	$ 141	$ 11,295	$ (3,195)	$ 21,466