Common Stock, $.01 par value per share Common Stock [Member] Entity Tax Identification Number Entity Tax Identification Number Depositary Shares (each representing 1/1,000th interest in a share of Series M Non-Cumulative Perpetual Preferred Stock, par value $1.00) Series M Preferred Stock [Member] Series M Preferred Stock [Member]. Entity File Number Entity File Number Cover [Abstract] Title of 12(b) Security Title of 12(b) Security Floating Rate Notes, Series CC (Senior), due May 21, 2028 Series CC (Senior), Floating [Member] Series CC (Senior), Floating Local Phone Number Local Phone Number Class of Stock [Domain] Class of Stock [Domain] Depositary Shares (each representing 1/1,000th interest in a share of Series B Non-Cumulative Perpetual Preferred Stock, par value $1.00) Series B Preferred Stock [Member] Soliciting Material Soliciting Material Entity Address, Address Line One Entity Address, Address Line One Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name Depositary Shares (each representing 1/1,000th interest in a share of Series O Non-Cumulative Perpetual Preferred Stock, par value $1.00) Series O Preferred Stock [Member] Series O Preferred Stock [Member] Entity Address, State or Province Entity Address, State or Province Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Written Communications Written Communications Entity Listings [Line Items] Entity Listings [Line Items] Trading Symbol Trading Symbol Debt Instrument [Axis] Debt Instrument [Axis] City Area Code City Area Code Depositary Shares (each representing 1/1,000th interest in a share of Series L Non-Cumulative Perpetual Preferred Stock, par value $1.00) Series L Preferred Stock [Member] Series L Preferred Stock [Member] Depositary Shares (each representing 1/100th interest in a share of Series A Non-Cumulative Perpetual Preferred Stock, par value $1.00) Series A Preferred Stock [Member] Entity Listings [Table] Entity Listings [Table] Document Period End Date Document Period End Date 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 Depositary Shares (each representing 1/1,000th interest in a share of Series K Non-Cumulative Perpetual Preferred Stock, par value $1.00) Series K Preferred Stock [Member] Series K Preferred Stock [Member] Document Type Document Type Class of Stock [Axis] Class of Stock [Axis] 4.009% Fixed-to-Floating Rate Notes, Series CC (Senior), due May 21, 2032 Series CC (Senior), Fixed-To-Floating [Member] Series CC (Senior), Fixed-to-Floating Pre-commencement Tender Offer Pre-commencement Tender Offer Entity Central Index Key Entity Central Index Key Entity Emerging Growth Company Entity Emerging Growth Company