v3.19.2
Document and Entity Information
Aug. 13, 2019
Document And Entity Information [Line Items]  
Entity Registrant Name Viacom Inc.
Amendment Flag false
Entity Central Index Key 0001339947
Document Type 8-K
Document Period End Date Aug. 13, 2019
Entity Incorporation, State or Country Code DE
Entity File Number 001-32686
Entity Tax Identification Number 20-3515052
Entity Address, Address Line One 1515 Broadway
Entity Address, City or Town New York
Entity Address, State or Province NY
Entity Address, Postal Zip Code 10036
City Area Code (212)
Local Phone Number 258-6000
Written Communications true
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Emerging Growth Company false
Common Class A [Member]  
Document And Entity Information [Line Items]  
Title of 12(b) Security Class A common stock, par value $0.001 per share
Trading Symbol VIA
Security Exchange Name NASDAQ
Common Class B [Member]  
Document And Entity Information [Line Items]  
Title of 12(b) Security Class B common stock, par value $0.001 per share
Trading Symbol VIAB
Security Exchange Name NASDAQ