Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($) $ in Millions	Total	Series D Preferred Stock	Series E Preferred Stock	Preferred Shares	Common Shares	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings	Retained Earnings Series D Preferred Stock	Retained Earnings Series E Preferred Stock
Beginning Balance at Dec. 31, 2024	$ 30,264			$ 0	$ 141	$ 11,370	$ (3,395)	$ 22,148
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	8,371							8,371
Other comprehensive income (loss)	146						146
Repurchase of common shares	(4,412)				(3)	(233)		(4,176)
Other changes	(190)					(78)		(112)
Cash dividends declared preferred		$ (43)							$ (43)
Cash dividends declared common	(1,719)							(1,719)
Ending Balance at Sep. 30, 2025	32,417			0	138	11,059	(3,249)	24,469
Beginning Balance at Jun. 30, 2025	32,311			0	140	11,052	(3,248)	24,367
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	2,902							2,902
Other comprehensive income (loss)	(1)						(1)
Repurchase of common shares	(2,338)				(2)	(119)		(2,217)
Other changes	124					126		(2)
Cash dividends declared preferred		(14)							(14)
Cash dividends declared common	(567)							(567)
Ending Balance at Sep. 30, 2025	32,417			0	138	11,059	(3,249)	24,469
Beginning Balance at Dec. 31, 2025	33,474			0	138	11,126	(3,277)	25,487
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	9,794							9,794
Other comprehensive income (loss)	(116)						(116)
Issuance of preferred shares	1,584					1,584
Redemption of preferred shares	(1,600)					(1,584)		(16)
Repurchase of common shares	(5,505)				(4)	(246)		(5,255)
Other changes	156					288		(132)
Cash dividends declared preferred		(43)	$ (9)						(43)	$ (9)
Cash dividends declared common	(1,938)							(1,938)
Ending Balance at Sep. 30, 2026	35,797			0	134	11,168	(3,393)	27,888
Beginning Balance at Jun. 30, 2026	34,280			0	135	11,121	(3,355)	26,379
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	3,712							3,712
Other comprehensive income (loss)	(38)						(38)
Issuance of preferred shares	1,584					1,584
Redemption of preferred shares	(1,600)					(1,584)		(16)
Repurchase of common shares	(1,600)				(1)	(79)		(1,520)
Other changes	123					126		(3)
Cash dividends declared preferred		$ (14)	$ (9)						$ (14)	$ (9)
Cash dividends declared common	(641)							(641)
Ending Balance at Sep. 30, 2026	$ 35,797			$ 0	$ 134	$ 11,168	$ (3,393)	$ 27,888