Contingencies and Commitments	12 Months Ended
Dec. 28, 2013
Contingencies and Commitments
Contingencies and Commitments	Note 13. Contingencies and Commitments We are subject to legal proceedings and other claims arising out of the conduct of our business, including proceedings and claims relating to commercial and financial transactions; government contracts; alleged lack of compliance with applicable laws and regulations; production partners; product liability; patent and trademark infringement; employment disputes; and environmental, safety and health matters. Some of these legal proceedings and claims seek damages, fines or penalties in substantial amounts or remediation of environmental contamination. As a government contractor, we are subject to audits, reviews and investigations to determine whether our operations are being conducted in accordance with applicable regulatory requirements. Under federal government procurement regulations, certain claims brought by the U.S. Government could result in our suspension or debarment from U.S. Government contracting for a period of time. On the basis of information presently available, we do not believe that existing proceedings and claims will have a material effect on our financial position or results of operations. In the ordinary course of business, we enter into standby letter of credit agreements and surety bonds with financial institutions to meet various performance and other obligations. These outstanding letter of credit arrangements and surety bonds aggregated to approximately $298 million and $323 million at December 28, 2013 and December 29, 2012, respectively. Environmental Remediation As with other industrial enterprises engaged in similar businesses, we are involved in a number of remedial actions under various federal and state laws and regulations relating to the environment that impose liability on companies to clean up, or contribute to the cost of cleaning up, sites on which hazardous wastes or materials were disposed or released. Our accrued environmental liabilities relate to installation of remediation systems, disposal costs, U.S. Environmental Protection Agency oversight costs, legal fees, and operating and maintenance costs for both currently and formerly owned or operated facilities. Circumstances that can affect the reliability and precision of the accruals include the identification of additional sites, environmental regulations, level of cleanup required, technologies available, number and financial condition of other contributors to remediation and the time period over which remediation may occur. We believe that any changes to the accruals that may result from these factors and uncertainties will not have a material effect on our financial position or results of operations. Based upon information currently available, we estimate that our potential environmental liabilities are within the range of $40 million to $170 million. At December 28, 2013, environmental reserves of approximately $74 million have been established to address these specific estimated liabilities. We estimate that we will likely pay our accrued environmental remediation liabilities over the next five to ten years and have classified $21 million as current liabilities. Expenditures to evaluate and remediate contaminated sites approximated $12 million, $15 million and $9 million in 2013, 2012 and 2011, respectively. Leases Rental expense approximated $95 million, $97 million and $93 million in 2013, 2012 and 2011, respectively. Future minimum rental commitments for noncancelable operating leases in effect at December 28, 2013 approximated $64 million for 2014, $46 million for 2015, $36 million for 2016, $28 million for 2017, $21 million for 2018 and a total of $148 million thereafter.

Note 13. Contingencies and Commitments

We are subject to legal proceedings and other claims arising out of the conduct of our business, including proceedings and claims relating to commercial and financial transactions; government contracts; alleged lack of compliance with applicable laws and regulations; production partners; product liability; patent and trademark infringement; employment disputes; and environmental, safety and health matters. Some of these legal proceedings and claims seek damages, fines or penalties in substantial amounts or remediation of environmental contamination. As a government contractor, we are subject to audits, reviews and investigations to determine whether our operations are being conducted in accordance with applicable regulatory requirements. Under federal government procurement regulations, certain claims brought by the U.S. Government could result in our suspension or debarment from U.S. Government contracting for a period of time. On the basis of information presently available, we do not believe that existing proceedings and claims will have a material effect on our financial position or results of operations.

In the ordinary course of business, we enter into standby letter of credit agreements and surety bonds with financial institutions to meet various performance and other obligations. These outstanding letter of credit arrangements and surety bonds aggregated to approximately $298 million and $323 million at December 28, 2013 and December 29, 2012, respectively.

Environmental Remediation

As with other industrial enterprises engaged in similar businesses, we are involved in a number of remedial actions under various federal and state laws and regulations relating to the environment that impose liability on companies to clean up, or contribute to the cost of cleaning up, sites on which hazardous wastes or materials were disposed or released. Our accrued environmental liabilities relate to installation of remediation systems, disposal costs, U.S. Environmental Protection Agency oversight costs, legal fees, and operating and maintenance costs for both currently and formerly owned or operated facilities. Circumstances that can affect the reliability and precision of the accruals include the identification of additional sites, environmental regulations, level of cleanup required, technologies available, number and financial condition of other contributors to remediation and the time period over which remediation may occur. We believe that any changes to the accruals that may result from these factors and uncertainties will not have a material effect on our financial position or results of operations.

Based upon information currently available, we estimate that our potential environmental liabilities are within the range of $40 million to $170 million. At December 28, 2013, environmental reserves of approximately $74 million have been established to address these specific estimated liabilities. We estimate that we will likely pay our accrued environmental remediation liabilities over the next five to ten years and have classified $21 million as current liabilities. Expenditures to evaluate and remediate contaminated sites approximated $12 million, $15 million and $9 million in 2013, 2012 and 2011, respectively.

Leases

Rental expense approximated $95 million, $97 million and $93 million in 2013, 2012 and 2011, respectively. Future minimum rental commitments for noncancelable operating leases in effect at December 28, 2013 approximated $64 million for 2014, $46 million for 2015, $36 million for 2016, $28 million for 2017, $21 million for 2018 and a total of $148 million thereafter.