Common Stock (par value $.01 per share) Common Stock [Member] Entity Tax Identification Number Entity Tax Identification Number Entity File Number Entity File Number Document And Entity Information [Abstract] Document And Entity Information [Abstract] Document And Entity Information [Abstract] Title of 12(b) Security Title of 12(b) Security Entities [Table] Entities [Table] Local Phone Number Local Phone Number Class of Stock [Domain] Class of Stock [Domain] Soliciting Material Soliciting Material Entity Address, Address Line One Entity Address, Address Line One 1.650% Senior Notes Due 2029 Senior Notes Due 2029 [Member] 1.650% Senior Notes Due 2029 Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name Entity Address, State or Province Entity Address, State or Province Depositary Shares, Each Representing a 1/40th Interest in a Share of Fixed Rate Non-Cumulative Perpetual Preferred Stock, Series N Series N Preferred Stock Member [Member] Series N Preferred Stock Member Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Class of Securities [Domain] Class of Securities [Domain] Class of Securities [Domain] Written Communications Written Communications Entity Information [Line Items] Entity Information [Line Items] Depositary Shares, Each Representing a 1/40th Interest in a Share of Fixed Rate Non-Cumulative Perpetual Preferred Stock, Series J Series J Preferred Stock [Member] Outstanding nonredeemable series J preferred stock or outstanding series J preferred stock. Classified within stockholders' equity if nonredeemable or redeemable solely at the option of the issuer. Classified within temporary equity if redemption is outside the control of the issuer. Trading Symbol Trading Symbol City Area Code City Area Code 4.832% Fixed-to-Floating Rate Senior Notes Due 2037 4.832% Fixed-to-Floating Rate Senior Notes Due 2037 [Member] 4.832% Fixed-to-Floating Rate Senior Notes Due 2037 Document Period End Date Document Period End Date Depositary Shares, Each Representing a 1/40th Interest in a Share of Fixed Rate Non-Cumulative Perpetual Preferred Stock, Series L Series L Preferred Stock Member [Member] Series L Preferred Stock Member Amendment Flag Amendment Flag Pre-commencement Issuer Tender Offer Pre-commencement Issuer Tender Offer Entity Address, City or Town Entity Address, City or Town Security Exchange Name Security Exchange Name Class of Securities [Axis] Class of Securities [Axis] Class of Securities 4.326% Fixed-to-Floating Rate Senior Notes Due 2032 4.326% Fixed-to-Floating Rate Senior Notes Due 2032 [Member] 4.326% Fixed-to-Floating Rate Senior Notes Due 2032 Depositary Shares, Each Representing a 1/40th Interest in a Share of Fixed Rate Non-Cumulative Perpetual Preferred Stock, Series K Series K Preferred Stock Member [Member] Outstanding nonredeemable series K preferred stock or outstanding series K preferred stock. Classified within stockholders' equity if nonredeemable or redeemable solely at the option of the issuer. Classified within temporary equity if redemption is outside the control of the issuer. Document Type Document Type Class of Stock [Axis] Class of Stock [Axis] Depositary Shares, Each Representing a 1/40th Interest in a Share of Fixed Rate Non-Cumulative Perpetual Preferred Stock, Series I Series I Preferred Stock [Member] Outstanding nonredeemable series I preferred stock or outstanding series I preferred stock. Classified within stockholders' equity if nonredeemable or redeemable solely at the option of the issuer. Classified within temporary equity if redemption is outside the control of the issuer. Pre-commencement Tender Offer Pre-commencement Tender Offer Entity Central Index Key Entity Central Index Key Class of Securities [Domain] Security Class [Domain] [Domain] for Security Class Entity Emerging Growth Company Entity Emerging Growth Company