CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Millions		Total	Preferred stock, Series H	Preferred stock Series I	Preferred stock, Series J	Preferred Stock Series K	Preferred stock, Series L	Class B Preferred stock, Series A	Cumulative Effect, Period of Adoption, Adjustment	[2]	Cumulative Effect, Period of Adoption, Adjusted Balance	Common Stock	Common Stock Cumulative Effect, Period of Adoption, Adjusted Balance	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 Preferred stock, Series H	Retained Earnings Preferred stock Series I	Retained Earnings Preferred stock, Series J	Retained Earnings Preferred Stock Series K	Retained Earnings Preferred stock, Series L	Retained Earnings Class B Preferred stock, Series A	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	[2]	Retained Earnings Cumulative Effect, Period of Adoption, Adjusted Balance	Accumulated Other Comprehensive (Loss) Income	Accumulated Other Comprehensive (Loss) Income Cumulative Effect, Period of Adoption, Adjusted Balance	Treasury Stock	Treasury Stock Cumulative Effect, Period of Adoption, Adjusted Balance
Beginning balance at Dec. 31, 2020		$ 23,111										$ 2,051		$ 2,116		$ 3,635		$ 18,384										$ 2,601		$ (5,676)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income		2,770																2,770
Other comprehensive (loss) income, net of tax		(1,394)																										(1,394)
Cash dividends declared:
Common stock		(805)																(805)
Preferred stock	[1]		$ (31)	$ (30)	$ (10)	$ (12)	$ (16)	$ (12)											$ (31)	$ (30)	$ (10)	$ (12)	$ (16)	$ (12)
Shares acquired for treasury		(1,393)																												(1,393)
Impact of stock transactions under stock compensation plans, net		33														(11)														44
Other		(1)																(2)												1
Ending balance at Dec. 31, 2021		22,210										2,051		2,116		3,624		20,236										1,207		(7,024)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income		2,446																2,446
Other comprehensive (loss) income, net of tax		(6,317)																										(6,317)
Cash dividends declared:
Common stock		(877)																(877)
Preferred stock	[1]		(31)	(30)	(15)	(12)	(16)	(12)											(31)	(30)	(15)	(12)	(16)	(12)
Shares acquired for treasury		(100)																												(100)
Impact of stock transactions under stock compensation plans, net		81														60														21
Other																														0
Ending balance at Dec. 31, 2022		$ 17,327							$ 37		$ 17,364	2,051	$ 2,051	2,116	$ 2,116	3,684	$ 3,684	21,689							$ 37		$ 21,726	(5,110)	$ (5,110)	(7,103)	$ (7,103)
Cash dividends declared:
Accounting Standards Update [Extensible List]		Accounting Standards Update 2022-02
Net Income		$ 2,349																2,349
Other comprehensive (loss) income, net of tax		623																										623
Common stock		(941)																(941)
Preferred stock	[1]		$ (42)	$ (30)	$ (25)	$ (12)	$ (16)	$ (12)											$ (42)	$ (30)	$ (25)	$ (12)	$ (16)	$ (12)
Shares acquired for treasury		(201)																												(201)
Impact of stock transactions under stock compensation plans, net		115														73														42
Ending balance at Dec. 31, 2023		$ 19,172										$ 2,051		$ 2,116		$ 3,757		$ 22,997										$ (4,487)		$ (7,262)

[1] Refer to Note 24 for further information on dividends declared for preferred stock.

[2] Related to the adoption of ASU 2022-02 as of January 1, 2023. Refer to Note 1 for additional information.