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PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Tables)
 6 Months Ended
Jun. 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
JUNE 2015
 
JUNE 2014
 
JUNE 2015
 
JUNE 2014
Service cost(1)
$
13

 
$
13

 
$
28

 
$
27

Interest cost
68

 
69

 
133

 
138

Expected return on plan assets
(121
)
 
(116
)
 
(239
)
 
(232
)
Amortization of actuarial loss
47

 
30

 
91

 
61

Amortization of prior service cost
1

 
2

 
2

 
3

Total net periodic benefit cost (credit)
$
8

 
$
(2
)
 
$
15

 
$
(3
)
(1)
Service cost includes $1 million and $2 million for quarter and 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.
 
OTHER POSTRETIREMENT BENEFITS
 
QUARTER ENDED
 
YEAR-TO-DATE ENDED
DOLLAR AMOUNTS IN MILLIONS
JUNE 2015
 
JUNE 2014
 
JUNE 2015
 
JUNE 2014
Interest cost
$
2

 
$
2

 
$
5

 
$
5

Amortization of actuarial loss
3

 
3

 
5

 
6

Amortization of prior service credit
(2
)
 
(47
)
 
(4
)
 
(95
)
Other
—

 
—

 
—

 
(4
)
Total net periodic benefit cost (credit)
$
3

 
$
(42
)
 
$
6

 
$
(88
)