Stocks Fall on Unwelcome 3M Results, Oil  NEW YORK (Reuters) - U.S. stocks fell on Monday as oil  prices held near \$55 a barrel and Dow component 3M Co. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=MMM.N target=/stocks/quickinfo/fullquote"&gt;MMM.N&lt;/A&gt;  posted results slightly below Wall Street estimates.