Capital Unit Class [Domain] Capital Units By Class [Axis] Common Stock [Member] Common Stock, without par value [Member] Schedule Of Capital Units [Table] Cover [Abstract] Entity Address, Address Line One Amendment Flag City Area Code Entity Address, City Or Town Document Information [Line Items] Document Period End Date Entity Incorporation, State or Country Code Local Phone Number Entity Address, Postal Zip Code Entity Address, State Or Province Title of 12(b) Security Trading Symbol Security Exchange Name Entity Registrant Name Entity Central Index Key Entity Tax Identification Number Document Type Written Communications Soliciting Material Pre-commencement Tender Offer Pre-commencement Issuer Tender Offer Entity File Number Entity Emerging Growth Company Zero Point One Four Two Percent Notes Due 2024 [Member] Zero Point Five Two Four Percent Notes Due 2028 [Member] Zero Point Eight Three Five Percent Notes Due 2032 [Member] One Point Four Zero Eight Percent Notes Due 2039 [Member]