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Pension Plans and Other Postretirement Benefits
 3 Months Ended
Mar. 31, 2016
Compensation and Retirement Disclosure [Abstract]  
Pension Plans and Other Postretirement Benefits
13. Pension Plans and Other Postretirement Benefits

The Company has contributory and non-contributory defined-benefit pension plans, which include both qualified and supplemental plans. The Company also provides certain health care and life insurance benefits for certain retired employees. Retiree health care benefits are funded by contributions from the retiree and, in certain circumstances, contributions from the Company. The Company’s retiree life insurance plan is noncontributory. The following summarizes the Company’s pension and other postretirement benefit cost:
 
Pension Benefits
 
Other Benefits
millions
2016
 
2015
 
2016
 
2015
Three Months Ended March 31
 
 
 
 
 
 
 
Service cost
$
26

 
$
30

 
$
1

 
$
3

Interest cost
26

 
25

 
3

 
4

Expected return on plan assets
(27
)
 
(27
)
 
—

 
—

Amortization of net actuarial loss (gain)
8

 
13

 
—

 
—

Amortization of net prior service cost (credit)
—

 
—

 
(6
)
 
—

Termination benefits expense
44

 
—

 
—

 
—

Curtailment expense
8

 
—

 
(3
)
 
—

Net periodic benefit cost
$
85

 
$
41

 
$
(5
)
 
$
7



In the first quarter of 2016, the Company initiated a workforce reduction program that resulted in a remeasurement of its pension and other postretirement benefit obligations. The Company recognized curtailment expense for both the curtailment-related increase in the benefit obligation and a proportionate share of prior service cost from other comprehensive income (loss). The Company also recognized termination benefits expense related to benefit enhancements to certain employees affected by the workforce reduction program. In addition, the remeasurement resulted in increases in the benefit obligation of $146 million for the pension benefit plans and $26 million for the other postretirement benefit plans, with a corresponding decrease in other comprehensive income.
The Company expects to contribute an additional $82 million in 2016 and $23 million in 2017 to unfunded pension plans related to the workforce reduction program. See Note 12—Restructuring Charges.