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Retirement Benefits (Unaudited)
 6 Months Ended
Jun. 30, 2016
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
2016
 
2015
 
2016
 
2015
2016
 
2015
 
2016
 
2015
Components of net periodic benefit cost
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
111

 
$
121

 
$
7

 
$
9

$
223

 
$
242

 
$
15

 
$
18

Interest cost
321

 
306

 
23

 
23

642

 
612

 
47

 
47

Expected return on plan assets
(463
)
 
(493
)
 
(22
)
 
(23
)
(926
)
 
(987
)
 
(43
)
 
(45
)
Amortization of:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Prior service credit
(15
)
 
(15
)
 
(5
)
 
(7
)
(30
)
 
(30
)
 
(11
)
 
(14
)
Net loss from previous years
179

 
170

 
5

 
8

357

 
341

 
8

 
14

Net periodic benefit cost
$
133

 
$
89

 
$
8

 
$
10

$
266

 
$
178

 
$
16

 
$
20


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
2016
 
2015
 
2016
 
2015
Defined benefit pension plans
$
20

 
$
19

 
$
47

 
$
544

Medical and life benefit plans
18

 
19

 
29

 
25

Defined contribution plans
71

 
65

 
158

 
150