each investment was other than temporary based on a number of factors, including, but not limited to, uncertainty regarding our intent to hold certain of these investments for a period of time that would be sufficient to recover our cost basis in the event of a market recovery; the fact that the fair value of each investment had continued to decline since the time that our cost basis initially exceeded its fair value; and the Company's uncertainty around the near-term prospects for certain of the investments. As a result of the other-than-temporary decline in fair value of these investments, the Company recognized impairment charges of approximately $81 million during the fourth quarter of 2008. Certain of these investments are classified as marketable securities, while others are classified as other investments in the consolidated balance sheets. These impairment charges were recorded to other income (loss) — net in the consolidated statement of income. Refer to the heading "Operations Review — Other Income (Loss) — Net," and Note 2 and Note 14 of Notes to Consolidated Financial Statements. 

Other Assets 

Our Company invests in infrastructure programs with our bottlers that are directed at strengthening our bottling system and increasing unit case volume. Additionally, our Company advances payments to certain customers to fund future marketing activities intended to generate profitable volume and expenses such payments over the periods benefited. Advance payments are also made to certain customers for distribution rights. Payments under these programs are generally capitalized and reported as other assets in our consolidated balance sheets. As of December 31, 2009, the carrying value of these assets was approximately $1,976 million, or 4 percent of our total assets. When facts and circumstances indicate that the carrying value of these assets may not be recoverable, management assesses the recoverability of the carrying value by preparing estimates of sales volume and the resulting gross profit and cash flows. These estimated future cash flows are consistent with those we use in our internal planning. If the sum of the expected future cash flows (undiscounted and without interest charges) is less than the carrying amount, we recognize an impairment loss. The impairment loss recognized is the amount by which the carrying amount exceeds the fair value. 

Property, Plant and Equipment 

As of December 31, 2009, the carrying value of our property, plant and equipment, net of depreciation, was approximately $9,561 million, or 20 percent of our total assets. Certain events or changes in circumstances may indicate that the recoverability of the carrying amount of property, plant and equipment should be assessed, including, among others, a significant decrease in market value, a significant change in the business climate in a particular market, or a current period operating or cash flow loss combined with historical losses or projected future losses. When such events or changes in circumstances are present, we estimate the future cash flows expected to result from the use of the asset (or asset group) and its eventual disposition. These estimated