As expected, 3M plans to reset its dividend after spinning off its healthcare unit.3M (MMM 2.00%) has been a dividend stalwart. The industrial conglomerate has paid dividends to its shareholders for over a century without interruption and has raised its payout annually for more than 60 straight years. The company's dividend-growth streak currently qualifies it as a Dividend King, a term  for companies that have increased their payouts for at least 50 years in a row. However, 3M is about to make a big change ...