Consolidated Statement of Condition (Parenthetical) - USD ($)	Jun. 30, 2023	Dec. 31, 2022
Assets:
Allowance for credit losses on available-for-sale securities	$ 0	$ 2,000,000
Allowance for credit losses on HTM investment securities	0	0
Investment securities held-to-maturity	56,863,000,000	57,913,000,000
Allowance for credit losses on loans	120,000,000	97,000,000
Accumulated depreciation	$ 6,035,000,000	$ 5,745,000,000
Shareholders’ equity:
Preferred stock, no par value (in dollars per share)	$ 0	$ 0
Preferred stock authorized (in shares)	3,500,000	3,500,000
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, shares authorized (in shares)	750,000,000	750,000,000
Common stock, shares issued (in shares)	503,879,642	503,879,642
Common stock, shares outstanding (in shares)	322,101,110	349,024,167
Treasury stock (shares)	181,778,532	154,855,475
Series D Preferred Stock
Shareholders’ equity:
Preferred stock, shares issued (in shares)	7,500	7,500
Preferred stock, shares outstanding (in shares)	7,500	7,500
Series F Preferred Stock
Shareholders’ equity:
Preferred stock, shares issued (in shares)	2,500	2,500
Preferred stock, shares outstanding (in shares)	2,500	2,500
Series G Preferred Stock
Shareholders’ equity:
Preferred stock, shares issued (in shares)	5,000	5,000
Preferred stock, shares outstanding (in shares)	5,000	5,000
Series H Preferred Stock
Shareholders’ equity:
Preferred stock, shares issued (in shares)	5,000	5,000
Preferred stock, shares outstanding (in shares)	5,000	5,000