NEW YORK (S&P Global Ratings) Sept. 14, 2016--S&P Global Ratings today assigned its 'AA-' issue-level rating to 3M Co.'s proposed $1.50 billion medium-term notes, which the company will issue with varying maturities. The company will use the proceeds from these notes for general corporate purposes, including to repay its $1 billion medium-term notes due Sept. 29, 2016. All of our other ratings on 3M are unchanged. Our strong assessment of 3M's business risk profile and our modest assessment of its financial risk profile result in two possible anchors: 'a+' and 'a'. We choose to assign the 'a+' anchor to 3M given that its business risk profile is stronger than many of its comparably rated peers. Since 3M has five operating