If I did the math correctly, a $13B buyback at $52/share (it'll never happen at 52; stock will gradually move over 60 through next year) works out to 250 million shares to be repurchased over the next 2 years.
Once trading settles down, if you assume PM trades 5 million shares/day, that means PM will purchase 500,000 shares/day. So that's 10% of the daily volume over the next 2 years will be bought back. That constant support is just incredible.
PM buying 10% of the daily volume a day for 2 years. Truly remarkable.