To compete, Peacock intends to have 15,000 hours of content from its vast library available on both its ad-supported and subscription-based services. Highlights will include complete seasons of “Parks and Recreation,” “Brooklyn Nine-Nine,” “Cheers,” “Downton Abbey,” “Everybody Loves Raymond,” “Friday Night Lights” and “Frasier.” In June, NBCUniversal paid a $500 million to regain the rights to “The Office,” according to a person familiar with the deal who spoke on condition of anonymity because the terms were not public. The show will become available on Peacock in 2020.

Competition for older network shows has become fierce in the streaming era. On Monday, Netflix won the rights to “Seinfeld,” beginning in 2021, paying more than $500 million, according to two people familiar with the deal. In July, WarnerMedia secured the streaming rights to “Friends” for its service, HBO Max. And shortly before the introduction of Peacock on Tuesday, WarnerMedia said that HBO Max now has the rights to “Big Bang Theory,” the first time the long-running hit comedy will be available for streaming in the United States.

On the film side of Peacock, movies from Universal Pictures, Focus Features and DreamWorks Animation — including “Bridesmaids,” “American Pie,” “Do the Right Thing” and “E.T.” — will be featured. There will also be 3,000 hours of content from the Spanish-language network Telemundo, including an original dramedy titled “Armas de Mujer,” and popular library titles such as “100 Dias Para Volver” and “Betty in NY.” Pricing details for Peacock subscriptions have not been made public.

The company intends to use the 2020 Summer Olympics in Tokyo, which will be broadcast on NBC and its affiliated networks, to publicize Peacock heavily. Soon after the closing ceremony, roughly a dozen new shows that incorporate elements of older properties will make their debuts on the platform.