Consolidated Statement of Condition (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Assets, Current [Abstract]
Debt securities, AFS, allowance	$ 2	$ 2
Debt securities, HTM, allowance	0	0
Allowance for credit losses	97	87
Investment securities held-to-maturity	57,913	42,271
Accumulated depreciation	$ 5,745	$ 5,391
Stockholders' Equity Attributable to Parent [Abstract]
Preferred stock, no par value (in USD per share)	$ 0
Preferred stock authorized (in shares)	3,500,000
Common stock, par value (in USD per share)	$ 1
Common stock, shares authorized (in shares)	750,000,000
Common stock, shares issued (in shares)	503,879,642	503,879,642
Common stock, shares outstanding (in shares)	349,024,167	365,982,820
Treasury stock, shares (in shares)	154,855,475	137,896,822
Other assets	$ 37,902	$ 37,615
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