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Retirement Benefits (Unaudited)
 3 Months Ended
Mar. 31, 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 March 31
 
Pension
Benefits
 
Medical and
Life Benefits
$ in millions
2015
 
2014
 
2015
 
2014
Components of net periodic benefit cost
 
 
 
 
 
 
 
Service cost
$
121

 
$
114

 
$
9

 
$
8

Interest cost
306

 
315

 
24

 
26

Expected return on plan assets
(494
)
 
(467
)
 
(22
)
 
(21
)
Amortization of:
 
 
 
 
 
 
 
Prior service credit
(15
)
 
(15
)
 
(7
)
 
(7
)
Net loss from previous years
171

 
82

 
6

 
2

Net periodic benefit cost
$
89

 
$
29

 
$
10

 
$
8


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 March 31
$ in millions
2015
 
2014
Defined benefit pension plans
$
525

 
$
21

Post-retirement benefit plans
6

 
7

Defined contribution plans
85

 
73