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PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Tables)
 9 Months Ended
Sep. 30, 2015
Components of Net Periodic Benefit Costs (Credits)
The components of net periodic benefit costs (credits) are:
 
PENSION
 
QUARTER ENDED
 
YEAR-TO-DATE ENDED
DOLLAR AMOUNTS IN MILLIONS
SEPTEMBER 2015
 
SEPTEMBER 2014
 
SEPTEMBER 2015
 
SEPTEMBER 2014
Service cost(1)
$
14

 
$
13

 
$
42

 
$
40

Interest cost
65

 
67

 
198

 
205

Expected return on plan assets
(115
)
 
(117
)
 
(354
)
 
(349
)
Amortization of actuarial loss
44

 
33

 
135

 
94

Amortization of prior service cost
1

 
1

 
3

 
4

Loss due to curtailment and special termination benefits(2)
—

 
9

 
—

 
9

Total net periodic benefit cost (credit)
$
9

 
$
6

 
$
24

 
$
3

(1)
Service cost includes $2 million year-to-date ended 2014 for employees that were part of the Real Estate Divestiture. These charges are included in our results of discontinued operations.
(2) The 2014 loss due to curtailment and special termination benefits are related to involuntary terminations caused by restructuring activities, as well as the Real Estate Divestiture.
 
OTHER POSTRETIREMENT BENEFITS
 
QUARTER ENDED
 
YEAR-TO-DATE ENDED
DOLLAR AMOUNTS IN MILLIONS
SEPTEMBER 2015
 
SEPTEMBER 2014
 
SEPTEMBER 2015
 
SEPTEMBER 2014
Interest cost
$
2

 
$
3

 
$
7

 
$
8

Amortization of actuarial loss
2

 
3

 
7

 
9

Amortization of prior service credit
(2
)
 
(25
)
 
(6
)
 
(120
)
Other
—

 
—

 
—

 
(4
)
Total net periodic benefit cost (credit)
$
2

 
$
(19
)
 
$
8

 
$
(107
)