Soliciting Material Soliciting Material Written Communications Written Communications Local Phone Number Local Phone Number Class of Stock [Domain] Class of Stock [Domain] Document And Entity Information [Abstract] Document And Entity Information [Abstract] Document And Entity Information [Abstract] Amendment Flag Amendment Flag 1.650% Senior Notes Due 2029 Senior Notes Due 2029 [Member] 1.650% Senior Notes Due 2029 Entity Emerging Growth Company Entity Emerging Growth Company Entity File Number Entity File Number Security Exchange Name Security Exchange Name 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. Entity Address, State or Province Entity Address, State or Province Entity Address, Address Line One Entity Address, Address Line One 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 City Area Code City Area Code Entity Information [Line Items] Entity Information [Line Items] Document Period End Date Document Period End Date Pre-commencement Tender Offer Pre-commencement Tender Offer Class of Stock [Axis] Class of Stock [Axis] Entity Central Index Key Entity Central Index Key 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 Pre-commencement Issuer Tender Offer Pre-commencement Issuer Tender Offer Entity Tax Identification Number Entity Tax Identification Number Entities [Table] Entities [Table] Entity Registrant Name Entity Registrant Name Trading Symbol Trading Symbol Class of Securities [Axis] Class of Securities [Axis] Class of Securities Common Stock (par value $.01 per share) Common Stock [Member] 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 Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code 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. Title of 12(b) Security Title of 12(b) Security Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Address, City or Town Entity Address, City or Town 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. Document Type Document Type 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] Series N Preferred Stock Member Class of Securities [Domain] Security Class [Domain] [Domain] for Security Class