Working capital generated cash of $104 in 2013 as compared to $21 in 2012. Cash of $12 and $146 was generated from  declining receivables in 2013 and 2012. We also generated cash of $50 and $38 from lower inventory levels in 2013 and 2012. Increases in accounts payable and other net liabilities provided cash of $42 in 2013 while decreases in accounts payable and  other net liabilities used cash of $163 in 2012. Investing activities  — As discussed above, we received proceeds in 2014 from the sale of a payment-in-kind note receivable  which included $35 of principal. During 2014, net purchases of marketable securities were primarily funded by cash receipts  related to the sale of our payment-in-kind notes receivable.Also during 2014, we received $9 that was released from escrow  related to the 2010 sale of our former Structural Products business. During 2013, we paid $8 related to our strategic alliance  with Fallbrook. As discussed above, we received a payment in 2013 on a payment-in-kind note receivable which included $33  of principal. During 2013, net purchases of marketable securities were primarily funded by cash receipts related to our  payment-in-kind notes receivable. During 2012, we paid $12 related to our strategic alliance with Fallbrook and we received  proceeds of $8 from the sale of our axle, dif ferential and brake systems business serving the leisure, all-terrain and utility  vehicle markets. Financing activities  — During 2014, we completed the sale of $425 in senior unsecured notes and paid financing costs of $7  related to the notes. Also during 2014, we redeemed $345 of our February 2019 Notes at a $15 premium. During 2013, we  completed the sale of $750 in senior unsecured notes and paid financing costs of $14 related to the notes and $3 to amend our  revolving facility. During 2012, we increased borrowings primarily in international locations experiencing historically  favorable interest rates. During 2013, we used cash of $474 to redeem our Series  A preferred stock and $7 to purchase the  noncontrolling interests in our United Kingdom subsidiaries.  We used cash of $260, $337 and $15 to repurchase common  shares under our share repurchase program in 2014, 2013 and 2012.  We used $8, $28 and $31 for dividend payments to  preferred stockholders in 2014, 2013 and 2012 and used $32, $30 and $30 for dividend payments to common stockholders in  2014, 2013 and 2012. Distributions to noncontrolling interest totaled $9, $1 1 and $11 in 2014, 2013 and 2012. We are obligated to make future cash payments in fixed amounts under various agreements.  The following table  summarizes our significant contractual obligations as of  December 31, 2014. Contractual Obligations Payments Due by Period Contractual Cash Obligations Total 2015 2016 - 2017 2018 - 2019 After 2019 Long-term debt (1) $ 1,659 $ 46 $ 63 $ 22 $ 1,528 Interest payments (2) 736 96 186 181 273 Leases (3) 156 35 53 25 43 Unconditional purchase obligations (4) 128 125 2 1 Pension contribution (5) 13 13 Retiree health care benefits (6) 59 5 12 12 30 Uncertain income tax positions (7) Total contractual cash obligations $ 2,751 $ 320 $ 316 $ 241 $ 1,874 ______________________________________________________ Notes: 32 (1)  Principal payments on long-term debt and capital lease obligations in place at  December 31, 2014. (2)  Interest payments are based on long-term debt and capital leases in place at  December 31, 2014 and the interest rates applicable to such obligations. (3)  Operating leases related to real estate, vehicles and other assets. (4)  Unconditional purchase obligations are comprised principally of commitments for procurement of fixed assets and the purchase of raw materials. (5)  This amount represents estimated 2015 minimum required contributions to our global defined benefit pension plans.  We have not estimated pension  contributions beyond 2015 due to the significant impact that return on plan assets and changes in discount rates might have on such amounts. (6)  This amount represents estimated payments under our non-U.S. retiree health care programs. Obligations under the non-U.S. retiree health care programs  are not fixed commitments and will vary depending on various factors, including the level of participant utilization and inflation. Our estimates of the  payments to be made in the future consider recent payment trends and certain of our actuarial assumptions. (7)  We are not able to reasonably estimate the timing of payments related to uncertain tax positions because the timing of settlement is uncertain.  The above  table does not reflect unrecognized tax benefits at  December 31, 2014 of $109. See Note 17 to our consolidated financial statements in Item 8 for  additional discussion.