Entity Central Index Key Entity Central Index Key Entity Address, Address Line One Entity Address, Address Line One Entity File Number Entity File Number Trading Symbol Trading Symbol Soliciting Material Soliciting Material Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Depositary Shares, each representing a 1/1,000th interest in a share of 6.750% Non-Cumulative Preferred Stock, Series B Series B Preferred Stock [Member] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Class of Stock [Domain] Class of Stock [Domain] Entity Listings [Line Items] Entity Listings [Line Items] City Area Code City Area Code Depositary Shares, each representing a 1/1,000th interest in a share of 5.375% Non-Cumulative Preferred Stock, Series C Series C Preferred Stock [Member] Title of 12(b) Security Title of 12(b) Security Entity Listings [Table] Entity Listings [Table] Amendment Flag Amendment Flag 6.250% Junior Subordinated Debentures due 2058 Junior Subordinated Debt [Member] Entity Registrant Name Entity Registrant Name Security Exchange Name Security Exchange Name Document Period End Date Document Period End Date Entity Tax Identification Number Entity Tax Identification Number Depositary Shares, each representing a 1/1,000th interest in a share of 6.600% Non-Cumulative Preferred Stock, Series A Series A Preferred Stock [Member] Common Stock, par value $0.01 per share Common Stock [Member] Pre-commencement Issuer Tender Offer Pre-commencement Issuer Tender Offer Entity Address, City or Town Entity Address, City or Town Class of Stock [Axis] Class of Stock [Axis] Local Phone Number Local Phone Number Written Communications Written Communications Cover [Abstract] Depositary Shares, each representing a 1/1,000th interest in a share of 4.625% Non-Cumulative Preferred Stock, Series D Series D Preferred Stock [Member] Document Type Document Type Entity Emerging Growth Company Entity Emerging Growth Company Entity Address, State or Province Entity Address, State or Province Pre-commencement Tender Offer Pre-commencement Tender Offer