Class of Stock [Domain] Class of Stock [Domain] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Entities [Table] Entities [Table] Entity Listings, Exchange [Axis] Entity Listings, Exchange [Axis] Common Class B [Member] Common Class B [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 Entity Tax Identification Number Entity Tax Identification Number Amendment Flag Amendment Flag Address Type [Domain] Address Type [Domain] Trading Symbol Trading Symbol Entity Registrant Name Entity Registrant Name Pre-commencement Tender Offer Pre-commencement Tender Offer Entity Emerging Growth Company Entity Emerging Growth Company NEW YORK STOCK EXCHANGE, INC. [Member] NEW YORK STOCK EXCHANGE, INC. [Member] Entity Central Index Key Entity Central Index Key Entity File Number Entity File Number Entity Address, State or Province Entity Address, State or Province CBOE STOCK EXCHANGE [Member] CBOE STOCK EXCHANGE [Member] Common Class A [Member] Common Class A [Member] Pre-commencement Issuer Tender Offer Pre-commencement Issuer Tender Offer 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 Exchange [Domain] Exchange [Domain] Title of 12(b) Security Title of 12(b) Security Former Address [Member] Former Address [Member] Document Period End Date Document Period End Date Entity Information [Line Items] Entity Information [Line Items] Document Type Document Type Entity Addresses, Address Type [Axis] Entity Addresses, Address Type [Axis]