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EMPLOYEE BENEFITS
3 Months Ended
Mar. 31, 2015
EMPLOYEE BENEFITS  
EMPLOYEE BENEFITS

14. EMPLOYEE BENEFITS

The following table presents the components of net periodic benefit cost with respect to pensions and other postretirement benefits:

Pension Postretirement
U.S.Non-U.S.U.S.Non-U.S.
(in millions)PlansPlansTotalPlansPlansTotal
Three Months Ended March 31, 2015
Components of net periodic benefit cost:
Service cost$52$11$63$2$1$3
Interest cost55661213
Expected return on assets(72)(6)(78)---
Amortization of prior service (credit) cost(8)(1)(9)(3)-(3)
Amortization of net (gain) loss32335---
Net periodic benefit cost$59$13$72$1$2$3
Three Months Ended March 31, 2014
Components of net periodic benefit cost:
Service cost$44$11$55$1$-$1
Interest cost57764213
Expected return on assets(71)(6)(77)---
Amortization of prior service (credit) cost(8)(1)(9)(2)-(2)
Amortization of net (gain) loss11213---
Curtailment (gain) loss------
Net periodic benefit cost$33$13$46$1$1$2

For the three-month period ended March 31, 2015, we contributed $56 million to our U.S. and non-U.S. pension plans and we estimate that we will contribute an additional $117 million for the remainder of 2015. These estimates are subject to change because contribution decisions are affected by various factors, including our liquidity, market performance and management discretion.