system
A chat on subreddit /r/wallstreetbets
human
iirc it was an authorization of $10B towards buybacks open ended.  The stated goal was to use 50% of FCF for 'enhanced capital return' starting FY19 (September 2018).  This may at some point mean dividends.  I seem to recall Zinsner stating they have used roughly ~70% of FCF for buybacks this year.

gpt
70% seems much more inline with what I expected by now. Not sure where OP is getting his $2.6B figure for their total buyback amount. Cheers.