Consolidated Statement of Condition (Parenthetical) - USD ($)	Dec. 31, 2024	Dec. 31, 2023
Assets, Current [Abstract]
Debt securities, AFS, allowance	$ 0	$ 0
Debt securities, HTM, allowance	0	1,000,000
Investment securities held-to-maturity	41,906,000,000	51,503,000,000
Allowance for credit losses	174,000,000	135,000,000
Accumulated depreciation	$ 6,461,000,000	$ 6,062,000,000
Stockholders' Equity Attributable to Parent [Abstract]
Preferred stock, no par value (in USD per share)	$ 0	$ 0
Preferred stock authorized (in shares)	3,500,000	3,500,000
Common stock, par value (in USD 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)	288,766,452	301,944,043
Treasury stock, shares (in shares)	215,113,190	201,935,599
Series D Preferred Stock
Stockholders' Equity Attributable to Parent [Abstract]
Preferred stock, shares issued (in shares)	7,500
Preferred stock, shares outstanding (in shares)	7,500
Series F Preferred Stock
Stockholders' Equity Attributable to Parent [Abstract]
Preferred stock, shares issued (in shares)	2,500
Preferred stock, shares outstanding (in shares)	2,500
Series G Preferred Stock
Stockholders' Equity Attributable to Parent [Abstract]
Preferred stock, shares issued (in shares)	5,000
Preferred stock, shares outstanding (in shares)	5,000
Series H Preferred Stock
Stockholders' Equity Attributable to Parent [Abstract]
Preferred stock, shares issued (in shares)	5,000
Preferred stock, shares outstanding (in shares)	5,000
Series I Preferred Stock
Stockholders' Equity Attributable to Parent [Abstract]
Preferred stock, shares issued (in shares)	15,000
Preferred stock, shares outstanding (in shares)	15,000
Series J Preferred Stock
Stockholders' Equity Attributable to Parent [Abstract]
Preferred stock, shares issued (in shares)	8,500
Preferred stock, shares outstanding (in shares)	8,500