Nov 2 (Reuters) - National Australia Bank Ltd NAB.AX
* FY net interest margin down 3 basis points or up 1 bp excluding markets & treasury
* "Cost savings of greater than $1 billion are targeted by the end of FY20 as we further simplify our business"
* "Estimated $1.5 billion increase in investment by the end of FY20"
* Board expects to maintain FY18 dividends at the FY17 level