Class of Stock [Domain] Class of Stock [Domain] 6.250% Junior Subordinated Debentures due 2058 Junior Subordinated Debt [Member] 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 6.600% Non-Cumulative Preferred Stock, Series A Series A Preferred Stock [Member] Class of Stock [Axis] Class of Stock [Axis] Security Exchange Name Security Exchange Name Entity Address, City or Town Entity Address, City or Town Soliciting Material Soliciting Material Cover [Abstract] City Area Code City Area Code Common Stock, par value $0.01 per share Common Stock [Member] Entity Tax Identification Number Entity Tax Identification Number Amendment Flag Amendment Flag 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] Entity Registrant Name Entity Registrant Name Trading Symbol Trading Symbol Pre-commencement Tender Offer Pre-commencement Tender Offer Entity Emerging Growth Company Entity Emerging Growth Company Entity Central Index Key Entity Central Index Key Entity File Number Entity File Number Entity Address, State or Province Entity Address, State or Province Entity Listings [Table] Entity Listings [Table] Pre-commencement Issuer Tender Offer Pre-commencement Issuer Tender Offer 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, Address Line One Entity Address, Address Line One Entity Address, Postal Zip Code Entity Address, Postal Zip Code Written Communications Written Communications Local Phone Number Local Phone Number 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 Document Period End Date Document Period End Date Entity Listings [Line Items] Entity Listings [Line Items] Document Type Document Type