of all other pension plan assets was $2,035 million. The majority of this underfunding is attributable to an international pension plan for certain non-U.S. employees that is unfunded due to tax law restrictions, as well as our unfunded U.S. nonqualified pension plans. These U.S. nonqualified pension plans provide, for certain associates, benefits that are not permitted to be funded through a qualified plan because of limits imposed by the Internal Revenue Code of 1986. The expected benefit payments for these unfunded pension plans are not included in the table above. However, we anticipate annual benefit payments for these unfunded pension plans to be approximately $65 million in 2013 and remain near that level through 2025, decreasing annually thereafter. Refer to Note 13 of Notes to Consolidated Financial Statements. 

In 2013, we expect to contribute an additional $640 million to various pension plans. Refer toNote 13 of Notes to Consolidated Financial Statements. We did not include our estimated contributions to our various plans in the table above. 

In general, we are self-insured for large portions of many different types of claims; however, we do use commercial insurance above our self-insured retentions to reduce the Company's risk of catastrophic loss. Our reserves for the Company's self-insured losses are estimated through actuarial procedures of the insurance industry and by using industry assumptions, adjusted for our specific expectations based on our claim history. As of December 31, 2012, our self-insurance reserves totaled approximately $508 million. Refer to Note 11 of Notes to Consolidated Financial Statements. We did not include estimated payments related to our self-insurance reserves in the table above. 

Deferred income tax liabilities as of December 31, 2012, were $5,312 million. Refer to Note 14 of Notes to Consolidated Financial Statements. This amount is not included in the total contractual obligations table because we believe that presentation would not be meaningful. Deferred income tax liabilities are calculated based on temporary differences between the tax bases of assets and liabilities and their respective book bases, which will result in taxable amounts in future years when the liabilities are settled at their reported financial statement amounts. The results of these calculations do not have a direct connection with the amount of cash taxes to be paid in any future periods. As a result, scheduling deferred income tax liabilities as payments due by period could be misleading, because this scheduling would not relate to liquidity needs. 

Foreign Exchange 

Our international operations are subject to certain opportunities and risks, including currency fluctuations and governmental actions. We closely monitor our operations in each country and seek to adopt appropriate strategies that are responsive to changing economic and political environments, and to fluctuations in foreign currencies. 

In 2012, we used 81 functional currencies. Due to our global operations, weakness in some of these currencies might be offset by strength in others. In2012, 2011 and 2010, the weighted-average exchange rates for foreign