My god, that $50 billion expansion is 7% of the company at the current market cap.
I'm glad to see them returning capital to shareholders. However I worry about the debt they're taking on in order to do so, due to most of their cash being overseas. If things continue to slide for them, for whatever reason (iPhone loses favor, smartphone sales keep contracting globally, something replaces the smartphone, etc), it will pin them into a disastrous situation of extremely high debt and crashing sales (while having committed to very large payouts to shareholders).
Not a great situation to be in but I can't imagine it getting big enough to where Apple could no longer handle it. Maybe I'm underestimating interest rates