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Retirement Benefits (Unaudited)
 9 Months Ended
Sep. 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 September 30
Nine Months Ended September 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

 
$
114

 
$
8

 
$
8

$
363

 
$
343

 
$
26

 
$
25

Interest cost
306

 
314

 
24

 
25

918

 
944

 
71

 
75

Expected return on plan assets
(494
)
 
(467
)
 
(22
)
 
(21
)
(1,481
)
 
(1,402
)
 
(67
)
 
(63
)
Amortization of:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Prior service credit
(15
)
 
(14
)
 
(7
)
 
(12
)
(45
)
 
(44
)
 
(21
)
 
(32
)
Net loss from previous years
170

 
81

 
6

 
3

511

 
245

 
20

 
9

Other
—

 
1

 
—

 
—

—

 
1

 
—

 
—

Net periodic benefit cost
$
88

 
$
29

 
$
9

 
$
3

$
266

 
$
87

 
$
29

 
$
14


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 September 30
 
Nine Months Ended September 30
$ in millions
2015
 
2014
 
2015
 
2014
Defined benefit pension plans
$
20

 
$
20

 
$
564

 
$
59

Post-retirement benefit plans
19

 
17

 
44

 
43

Defined contribution plans
77

 
63

 
227

 
210