CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (unaudited) - USD ($) $ in Millions	Total	Cumulative Effect, Period of Adoption, Adjustment	[1]	Cumulative Effect, Period of Adoption, Adjusted Balance	Series I Preferred Stock	Series J Preferred Stock	Series K Preferred Stock	Series L Preferred Stock	Class B, Series A Preferred Stock	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 Cumulative Effect, Period of Adoption, Adjustment	[1]	Retained Earnings Cumulative Effect, Period of Adoption, Adjusted Balance	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	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, 2021	$ 22,210									$ 2,051		$ 2,116		$ 3,624		$ 20,236									$ 1,207		$ (7,024)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	494															494
Other comprehensive income (loss), net of tax	(2,303)																								(2,303)
Cash dividends declared:
Common stock	(209)															(209)
Preferred stock					$ (7)	$ (3)	$ (3)	$ (4)	$ (3)											$ (7)	$ (3)	$ (3)	$ (4)	$ (3)
Impact of stock transactions under stock compensation plans, net	5													(9)													14
Ending balance at Mar. 31, 2022	20,177									2,051		2,116		3,615		20,501									(1,096)		(7,010)
Beginning balance at Dec. 31, 2021	22,210									2,051		2,116		3,624		20,236									1,207		(7,024)
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 Enumeration]	Accounting Standards Update 2022-02
Net Income	$ 558															558
Other comprehensive income (loss), net of tax	865																								865
Common stock	(229)															(229)
Preferred stock					$ (7)	$ (6)	$ (3)	$ (4)	$ (3)											$ (7)	$ (6)	$ (3)	$ (4)	$ (3)
Shares acquired for treasury	(201)																										(201)
Impact of stock transactions under stock compensation plans, net	30													(2)													32
Ending balance at Mar. 31, 2023	$ 18,364									$ 2,051		$ 2,116		$ 3,682		$ 22,032									$ (4,245)		$ (7,272)

[1] Related to the adoption of ASU 2022-02 as of January 1, 2023. Refer to Note 3 for additional information.