with the sum of the individual values typically being larger than the value for the total Company. 3M’s market value at both September 30, 2012 and December 31, 2012 was significantly in excess of its equity of approximately $18 billion. 3M is an integrated materials enterprise, thus many of 3M’s businesses could not easily be sold on a stand-alone basis. 3M’s focus on research and development has resulted in a portion of 3M’s value being comprised of internally developed businesses that have no goodwill associated with them. Based on its annual test in the fourth quarter of 2012, no goodwill impairment was indicated for any of the reporting units.

 

Factors which could result in future impairment charges include, among others, changes in worldwide economic conditions, changes in competitive conditions and customer preferences, and fluctuations in foreign currency exchange rates. These risk factors are discussed in Item 1A, “Risk Factors,” of this document. In addition, changes in the weighted average cost of capital could also impact impairment testing results. Given the current overall economic and other conditions in markets served by certain reporting units and asset groups within these reporting units (particularly Security Systems Division), 3M will continue to monitor conditions to assess whether long term expectations have been significantly impacted such that future interim impairment tests would be required. As of December 31, 2012, 3M had approximately $600 million of goodwill and approximately $300 million of long-lived assets related to Security Systems. Long-lived assets with a definite life are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset (asset group) may not be recoverable. If future non-cash asset impairment charges are taken, 3M would expect that only a portion of the long-lived assets or goodwill would be impaired. 3M will continue to monitor its reporting units and asset groups in 2013 for any triggering events or other indicators of impairment.

 

Income Taxes:

 

The extent of 3M’s operations involves dealing with uncertainties and judgments in the application of complex tax regulations in a multitude of jurisdictions. The final taxes paid are dependent upon many factors, including negotiations with taxing authorities in various jurisdictions and resolution of disputes arising from federal, state, and international tax audits. The Company recognizes potential liabilities and records tax liabilities for anticipated tax audit issues in the United States and other tax jurisdictions based on its estimate of whether, and the extent to which, additional taxes will be due. The Company follows guidance provided by ASC 740, Income Taxes, regarding uncertainty in income taxes, to record these liabilities (refer to Note 7 for additional information). The Company adjusts these reserves in light of changing facts and circumstances; however, due to the complexity of some of these uncertainties, the ultimate resolution may result in a payment that is materially different from the Company’s current estimate of the tax liabilities. If the Company’s estimate of tax