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Retirement Benefits (Unaudited)
 6 Months Ended
Jun. 30, 2015
Compensation and Retirement Disclosure [Abstract]  
RETIREMENT BENEFITS
RETIREMENT BENEFITS
The cost to the company of its retirement plans is shown in the following table:
 
Three Months Ended June 30
Six Months Ended June 30
 
Pension
Benefits
 
Medical and
Life Benefits
Pension
Benefits
 
Medical and
Life Benefits
$ in millions
2015
 
2014
 
2015
 
2014
2015
 
2014
 
2015
 
2014
Components of net periodic benefit cost
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
121

 
$
115

 
$
9

 
$
9

$
242

 
$
229

 
$
18

 
$
17

Interest cost
306

 
315

 
23

 
24

612

 
630

 
47

 
50

Expected return on plan assets
(493
)
 
(468
)
 
(23
)
 
(21
)
(987
)
 
(935
)
 
(45
)
 
(42
)
Amortization of:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Prior service credit
(15
)
 
(15
)
 
(7
)
 
(13
)
(30
)
 
(30
)
 
(14
)
 
(20
)
Net loss from previous years
170

 
82

 
8

 
4

341

 
164

 
14

 
6

Net periodic benefit cost
$
89

 
$
29

 
$
10

 
$
3

$
178

 
$
58

 
$
20

 
$
11


Employer Contributions
The company sponsors defined benefit pension and post-retirement plans, as well as defined contribution plans. We fund our defined benefit pension plans annually in a manner consistent with the Employee Retirement Income Security Act of 1974, as amended by the Pension Protection Act of 2006. Additionally, in the first quarter of 2015, we made a voluntary pension contribution of $500 million.
Contributions made by the company to its retirement plans are as follows:
 
Three Months Ended June 30
 
Six Months Ended June 30
$ in millions
2015
 
2014
 
2015
 
2014
Defined benefit pension plans
$
19

 
$
18

 
$
544

 
$
39

Post-retirement benefit plans
19

 
19

 
25

 
26

Defined contribution plans
65

 
74

 
150

 
147