Consolidated Statement of Condition (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Assets:
Allowance for credit losses on HTM investment securities	$ 1	$ 1
Investment securities held-to-maturity	44,925	51,503
Allowance for credit losses on loans	162	135
Accumulated depreciation	$ 6,400	$ 6,062
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)	294,191,001	301,944,043
Treasury stock (in shares)	209,688,641	201,935,599
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
Series I Preferred Stock
Shareholders’ equity:
Preferred stock, shares issued (in shares)	15,000	15,000
Preferred stock, shares outstanding (in shares)	15,000	15,000
Series J Preferred Stock
Shareholders’ equity:
Preferred stock, shares issued (in shares)	8,500	8,500
Preferred stock, shares outstanding (in shares)	8,500	8,500