3M 2015 Annual Report Download - page 149

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EXHIBIT18
February11,2016
BoardofDirectors
3MCompany
3MCenter
St.Paul,MN55144
DearDirectors:
WeareprovidingthislettertoyouforinclusionasanexhibittoyourForm10-KfilingpursuanttoItem601ofRegulationS-K.
WehaveauditedtheconsolidatedfinancialstatementsincludedintheCompany’sAnnualReportonForm10-Kfortheyear
endedDecember31,2015andissuedourreportthereondatedFebruary11,2016.Note1tothefinancialstatementsdescribes
achangeinaccountingprinciplefromamethodwhichclassifiesmarketablesecuritiesontheconsolidatedbalancesheetbased
onmanagement’sintendedholdingperiodtoamethodwhichclassifiesmarketablesecuritiesbasedonthenatureofthe
securitiesandtheiravailabilityforuseincurrentoperations.Itshouldbeunderstoodthatthepreferabilityofoneacceptable
methodofaccountingoveranotherfortheclassificationofmarketablesecuritieshasnotbeenaddressedinanyauthoritative
accountingliterature,andinexpressingourconcurrencebelowwehavereliedonmanagement’sdeterminationthatthischange
inaccountingprincipleispreferable.Basedonourreadingofmanagement’sstatedreasonsandjustificationforthischangein
accountingprincipleintheForm10-K,andourdiscussionswithmanagementastotheirjudgmentabouttherelevantbusiness
planningfactorsrelatingtothechange,weconcurwithmanagementthatsuchchangerepresents,intheCompany’s
circumstances,theadoptionofapreferableaccountingprincipleinconformitywithAccountingStandardsCodification250,
AccountingChangesandErrorCorrections.
Verytrulyyours,
/s/PricewaterhouseCoopersLLP
PricewaterhouseCoopersLLP
Minneapolis,Minnesota
EXHIBIT21