But it could mean the elevation of other executives within WarnerMedia. On Monday, Mr. Zaslav praised Toby Emmerich, the head of the film division, Casey Bloys, who runs HBO, and Jeff Zucker, the leader of CNN. Mr. Zucker and Mr. Zaslav are also longtime golfing buddies.

When asked about his plan for the management team, Mr. Zaslav said he would not favor Discovery executives.

“Philosophically, our view is we don’t know better,” he said. “There’s a reason WarnerMedia is where it is today.”

The companies expect the deal to be finalized in the middle of next year, and they anticipate annual cost savings of $3 billion. That usually means layoffs are coming.

WarnerMedia already went through several rounds of deep staff cuts after AT&T’s purchase of the company in 2018 as Mr. Stankey, who led the unit for a time, slimmed down the operations. Executives and managers were let go as he combined HBO, Warner Bros., CNN and the other cable networks under a single management team.

When Mr. Kilar came aboard last year, he cut further. Over 2,000 employees were laid off in the process.

To realize $3 billion in cost savings will inevitably mean more layoffs — at both WarnerMedia and Discovery. Mr. Zaslav said there was “a treasure trove of talent” at WarnerMedia, and emphasized the fact that Discovery doesn’t make scripted shows.

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