Entity Tax Identification Number Entity Tax Identification Number Entity File Number Entity File Number 6.25% 2069 Senior Notes Six Point Two Five Percent 2069 Senior Notes [Member] Six Point Two Five Percent 2069 Senior Notes Common Shares Common Class B [Member] Title of 12(b) Security Title of 12(b) Security Local Phone Number Local Phone Number Class of Stock [Domain] Class of Stock [Domain] Soliciting Material Soliciting Material Entity Address, Address Line One Entity Address, Address Line One Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name 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 Trading Symbol Trading Symbol Document and Entity Information [Abstract] Document and Entity Information [Abstract] Document and Entity Information [Abstract] City Area Code City Area Code 5.5% 2070 Senior Notes Five Point Five Percent June 2070 Senior Notes [Member] Five Point Five Percent June 2070 Senior Notes Statement [Table] Statement [Table] 5.5% 2070 Senior Notes Five Point Five Percent 2070 Senior Notes [Member] Five Point Five Percent 2070 Senior Notes 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 Statement [Line Items] Statement [Line Items] Security Exchange Name Security Exchange Name Document Type Document Type Class of Stock [Axis] Class of Stock [Axis] Pre-commencement Tender Offer Pre-commencement Tender Offer Entity Central Index Key Entity Central Index Key Entity Emerging Growth Company Entity Emerging Growth Company