Soliciting Material Soliciting Material Written Communications Written Communications Local Phone Number Local Phone Number Document Information [Line Items] Document Information [Line Items] Entity Listings, Exchange [Axis] Entity Listings, Exchange [Axis] Amendment Flag Amendment Flag Entity Emerging Growth Company Entity Emerging Growth Company Entity File Number Entity File Number Security Exchange Name Security Exchange Name NYSE Texas, Inc NYSE CHICAGO, INC. [Member] Entity Address, State or Province Entity Address, State or Province Entity Address, Address Line One Entity Address, Address Line One City Area Code City Area Code Document Period End Date Document Period End Date Exchange [Domain] Exchange [Domain] Document Information [Table] Document Information [Table] Entity Registrant Name Pre-commencement Tender Offer Entity Central Index Key Entity Central Index Key Pre-commencement Issuer Tender Offer Pre-commencement Issuer Tender Offer Entity Tax Identification Number Entity Tax Identification Number Entity Registrant Name Entity Registrant Name Trading Symbol Trading Symbol Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code 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 NEW YORK STOCK EXCHANGE, INC. NEW YORK STOCK EXCHANGE, INC. [Member] Document Type Document Type Document and Entity Information [Abstract] Document and Entity Information [Abstract] Document And Entity Information.