Four Point Seven Five Zero Percent Series A Fixed-To-Fixed Reset Rate Junior Subordinated Notes Due 2056 Four Point Seven Five Zero Percent Series A Fixed-To-Fixed Reset Rate Junior Subordinated Notes Due 2056 [Member] Four Point Seven Five Zero Percent Series A Fixed-To-Fixed Reset Rate Junior Subordinated Notes Due 2056 Soliciting Material Soliciting Material Written Communications Written Communications Local Phone Number Local Phone Number Class of Stock [Domain] Class of Stock [Domain] Document Information [Line Items] Document Information [Line Items] Amendment Flag Amendment Flag 3.850% Notes due 2034 Three Point Eight Five Zero Percent Notes Due 2034 [Member] M 3.850 Notes Due 20345 [Member] Entity Emerging Growth Company Entity Emerging Growth Company 3.650% Notes due 2030 Three Point Six Five Zero Percent Notes Due 2030 [Member] M 3.650 Notes Due 20304 [Member] Entity File Number Entity File Number 3.907% Notes due 2029 Three Point Nine Zero Seven Percent Notes Due 2029 [Member] M 3.907 Notes Due 20293 [Member] 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 3.600% Notes due 2032 Three Point Six Zero Zero Percent Notes Due 2032 [Member] Three Point Six Zero Zero Percent Notes Due 2032 City Area Code City Area Code Cover [Abstract] Cover [Abstract] Document Period End Date Document Period End Date 1.500% Notes due 2027 One Point Five Zero Zero Percent Notes Due 2027 [Member] M 1.500 Notes Due 20272 [Member] Document Information [Table] Document Information [Table] 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 Registrant Name Entity Registrant Name Trading Symbol Trading Symbol Common Stock, $.10 par value Common Stock [Member] Entity Incorporation State Country Code Entity Incorporation, State or Country Code Security 12b Title 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 Five Point Two Five Zero Percent Series B Fixed-To-Fixed Reset Rate Junior Subordinated Notes Due 2056 Five Point Two Five Zero Percent Series B Fixed-To-Fixed Reset Rate Junior Subordinated Notes Due 2056 [Member] Five Point Two Five Zero Percent Series B Fixed-To-Fixed Reset Rate Junior Subordinated Notes Due 2056