Consolidated Statement of Condition (Parenthetical) - USD ($)	Mar. 31, 2024	Dec. 31, 2023
Assets:
Allowance for credit losses on available-for-sale securities	$ 0	$ 0
Allowance for credit losses on HTM investment securities	1,000,000	1,000,000
Investment securities held-to-maturity	46,823,000,000	51,503,000,000
Allowance for credit losses on loans	135,000,000	135,000,000
Accumulated depreciation	$ 6,193,000,000	$ 6,062,000,000
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)	301,504,470	301,944,043
Treasury stock (in shares)	202,375,172	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