Consolidated Statement of Condition (Parenthetical) - USD ($)	Sep. 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	1,000,000	0
Investment securities held-to-maturity	54,121,000,000	57,913,000,000
Allowance for credit losses on loans	119,000,000	97,000,000
Accumulated depreciation	$ 6,148,000,000	$ 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)	308,583,511	349,024,167
Treasury stock (in shares)	195,296,131	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