Soliciting Material Soliciting Material Written Communications Written Communications Local Phone Number Local Phone Number Four Point Two Junior Subordinated Notes Due 2061 Four Point Two Junior Subordinated Notes Due 2061 [Member] Four Point Two Junior Subordinated Notes Due 2061 Class of Stock [Domain] Class of Stock [Domain] Address Type [Domain] Address Type [Domain] Amendment Flag Amendment Flag Entity Emerging Growth Company Entity Emerging Growth Company 5.875% Junior Subordinated Notes due 2059 Five Point Eight Seventy Five Junior Subordinated Notes Due 2059 [Member] Five Point Eight Seventy Five Junior Subordinated Notes Due 2059 Entity File Number Entity File Number Security Exchange Name Security Exchange Name Entity Address, State or Province Entity Address, State or Province Entity Address, Address Line One Entity Address, Address Line One Former Address Former Address [Member] City Area Code City Area Code Cover [Abstract] Cover [Abstract] Entity Information [Line Items] Entity Information [Line Items] Document Period End Date Document Period End Date Four Point Seventy Five Junior Subordinated Notes Due 2060 Four Point Seventy Five Junior Subordinated Notes Due 2060 [Member] Four Point Seventy Five Junior Subordinated Notes Due 2060 Pre-commencement Tender Offer Pre-commencement Tender Offer Class of Stock [Axis] Class of Stock [Axis] 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 Addresses, Address Type [Axis] Entity Addresses, Address Type [Axis] Entities [Table] Entities [Table] Entity Registrant Name Entity Registrant Name Trading Symbol Trading Symbol Six Point Seventy Five Junior Subordinated Notes Due 2064 Six Point Seventy Five Junior Subordinated Notes Due 2064 [Member] Six Point Seventy Five Junior Subordinated Notes Due 2064 Common Stock ($0.01 par value) Common Stock [Member] 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 Document Type Document Type