Extremely unlikely. $20 billion in cash + equivalents on hand, 40% operating margins -- they don't need to do layoffs right now, and they'll benefit much more if they ramp up hiring instead.
Especially because as they get bigger, their demand for 90th percentile types rather than 99.99th percentile types grows.
Plus, 15% would be a pretty small amount of deadwood at a company that size. It may just be specialists hired for departments that don't exist anymore or people that stopped caring 5 years ago, but have been around so long that they can't be fired.
...
when people deny any dead wood exists.