We have entered into several regional committed and uncommitted accounts receivable factoring programs with various financial institutions for certain of our receivables. The programs are accounted for as true sales of the receivables, without recourse to Ball, and had combined limits of approximately $1.8 billion at June 30, 2021, and $1.6 billion at December 31, 2020. A total of $327 million and $232 million were available for sale under such programs as of June 30, 2021, and December 31, 2020, respectively.
Contributions to the company’s defined benefit pension plans were $167 million in the first six months of 2021 compared to $11 million in the first six months of 2020, and such contributions are expected to be approximately $215 million for the full year of 2021. This estimate may change based on changes to the U.S. Pension Protection Act, the effects of the CARES Act and ARPA Act and the actual returns achieved on plan assets, among other factors.
We expect 2021 capital expenditures for property, plant and equipment will likely exceed $1.5 billion, and approximately $1.6 billion was contractually committed as of June 30, 2021.
As of June 30, 2021, approximately $403 million of our cash was held outside of the U.S. In the event we need to utilize any of the cash held outside the U.S. for purposes within the U.S., there are no material legal or other economic restrictions regarding the repatriation of cash from any of the countries outside the U.S. where we have cash. Management believes the company’s U.S. operating cash flows and cash on hand, together with its availability under long-term, revolving credit facilities, uncommitted short-term credit facilities and committed and uncommitted accounts receivable factoring programs, will be sufficient to meet the cash requirements of the U.S. portion of our ongoing operations, scheduled principal and interest payments on U.S. debt, dividend payments, capital expenditures and other U.S. cash requirements. If non-U.S. funds are needed for our U.S. cash requirements and we are unable to provide the funds through intercompany financing arrangements, we would be required to repatriate funds from non-U.S. locations where the company has previously asserted indefinite reinvestment of funds outside the U.S.
Based on its indefinite reinvestment assertion, the company has not provided deferred taxes on earnings in certain non-U.S. subsidiaries because such earnings are intended to be indefinitely reinvested in its international operations. It is not practical to estimate the additional taxes that may become payable if these earnings were remitted to the U.S.
Share Repurchases
The company’s share repurchases, net of issuances, totaled $128 million during the six months ended June 30, 2021, compared to $82 million of repurchases, net of issuances, during the same period of 2020. The company’s share repurchases are completed using cash on hand, cash provided by operating activities and available borrowings.
Debt Facilities and Refinancing
Given our cash flow projections and unused credit facilities that are available until March 2024, our liquidity is strong and is expected to meet our ongoing cash and debt service requirements. Total interest-bearing debt of $7.7 billion and $7.8 billion was outstanding at June 30, 2021, and December 31, 2020, respectively.
At June 30, 2021, taking into account our outstanding letters of credit, approximately $1.7 billion was available under existing long-term, multi-currency committed revolving credit facilities, which are available until March 2024. In addition to these facilities, the company had approximately $1 billion of short-term uncommitted credit facilities available as of June 30, 2021, of which $33 million was outstanding and due on demand.
While ongoing financial and economic conditions in certain areas may raise concerns about credit risk with counterparties to derivative transactions, the company mitigates its exposure by allocating the risk among various counterparties and limiting exposure to any one party. We also monitor the credit ratings of our suppliers, customers, lenders and counterparties on a regular basis.