CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (unaudited) - USD ($) $ in Millions	Total	Series H Preferred Stock	Series I Preferred Stock	Series J Preferred Stock	Series K Preferred Stock	Series L Preferred Stock	Class B, Series A Preferred Stock	Cumulative Effect, Period of Adoption, Adjustment	Cumulative Effect, Period of Adoption, Adjusted Balance	Common Stock	Common Stock Cumulative Effect, Period of Adoption, Adjusted Balance	Preferred Stock	Preferred Stock Series L Preferred Stock	Preferred Stock Cumulative Effect, Period of Adoption, Adjusted Balance	Capital Surplus	Capital Surplus Cumulative Effect, Period of Adoption, Adjusted Balance	Retained Earnings	Retained Earnings Series H Preferred Stock	Retained Earnings Series I Preferred Stock	Retained Earnings Series J Preferred Stock	Retained Earnings Series K Preferred Stock	Retained Earnings Series L Preferred Stock	Retained Earnings Class B, Series A Preferred Stock	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Retained Earnings Cumulative Effect, Period of Adoption, Adjusted Balance	Accumulated Other Comprehensive Loss	Accumulated Other Comprehensive Loss Cumulative Effect, Period of Adoption, Adjusted Balance	Treasury Stock	Treasury Stock Cumulative Effect, Period of Adoption, Adjusted Balance
Beginning balance at Dec. 31, 2023	$ 19,172							$ (10)	$ 19,162	$ 2,051	$ 2,051	$ 2,116		$ 2,116	$ 3,757	$ 3,757	$ 22,997							$ (10)	$ 22,987	$ (4,487)	$ (4,487)	$ (7,262)	$ (7,262)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,694																1,694
Other comprehensive income, net of tax	1,041																									1,041
Cash dividends declared:
Common stock	(740)																(740)
Preferred stock		$ (39)	$ (32)	$ (20)	$ (9)	$ (12)	$ (9)											$ (39)	$ (32)	$ (20)	$ (9)	$ (12)	$ (9)
Shares acquired for treasury	(327)																											(327)
Impact of stock transactions under stock compensation plans, net	75														27													48
Ending balance at Sep. 30, 2024	20,784									2,051		2,116			3,784		23,820									(3,446)		(7,541)
Beginning balance at Jun. 30, 2024	19,226									2,051		2,116			3,764		23,542									(4,901)		(7,346)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	573																573
Other comprehensive income, net of tax	1,455																									1,455
Cash dividends declared:
Common stock	(254)																(254)
Preferred stock		(13)	(11)	(7)	(3)	(4)	(3)											(13)	(11)	(7)	(3)	(4)	(3)
Shares acquired for treasury	(202)																											(202)
Impact of stock transactions under stock compensation plans, net	27														20													7
Ending balance at Sep. 30, 2024	20,784									2,051		2,116			3,784		23,820									(3,446)		(7,541)
Beginning balance at Dec. 31, 2024	19,645									2,051		2,116			3,804		24,150									(4,636)		(7,840)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,791																1,791
Other comprehensive income, net of tax	1,360																									1,360
Cash dividends declared:
Common stock	(770)																(770)
Preferred stock		(34)	(28)	(18)	(9)	(12)	(9)											(34)	(28)	(18)	(9)	(12)	(9)
Redemption of preferred stock, Series L						(350)							$ (346)									(4)
Shares acquired for treasury	(529)																											(529)
Impact of stock transactions under stock compensation plans, net	70														9													61
Ending balance at Sep. 30, 2025	21,107									2,051		1,770			3,813		25,057									(3,276)		(8,308)
Beginning balance at Jun. 30, 2025	21,124									2,051		2,116			3,794		24,718									(3,546)		(8,009)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	649																649
Other comprehensive income, net of tax	270																									270
Cash dividends declared:
Common stock	(269)																(269)
Preferred stock		$ (12)	$ (9)	$ (6)	$ (3)	(4)	$ (3)											$ (12)	$ (9)	$ (6)	$ (3)	(4)	$ (3)
Redemption of preferred stock, Series L						$ (350)							$ (346)									$ (4)
Shares acquired for treasury	(303)																											(303)
Impact of stock transactions under stock compensation plans, net	23														19													4
Ending balance at Sep. 30, 2025	$ 21,107									$ 2,051		$ 1,770			$ 3,813		$ 25,057									$ (3,276)		$ (8,308)