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Retirement Benefits (Unaudited)
 3 Months Ended
Mar. 31, 2014
Compensation and Retirement Disclosure [Abstract]  
RETIREMENT BENEFITS
RETIREMENT BENEFITS
The cost to the company of its defined benefit retirement plans are shown in the following table:
 
Three Months Ended March 31
 
Pension
Benefits
 
Medical and
Life Benefits
$ in millions
2014
 
2013
 
2014
 
2013
Components of net periodic benefit cost
 
 
 
 
 
 
 
Service cost
$
114

 
$
129

 
$
8

 
$
9

Interest cost
315

 
279

 
26

 
24

Expected return on plan assets
(467
)
 
(453
)
 
(21
)
 
(19
)
Amortization of:
 
 
 
 
 
 
 
Prior service credit
(15
)
 
(14
)
 
(7
)
 
(12
)
Net loss from previous years
82

 
152

 
2

 
7

Net periodic benefit cost
$
29

 
$
93

 
$
8

 
$
9


Employer Contributions
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. For the three months ended March 31, 2014, we made contributions of $21 million and $7 million to the company’s defined benefit pension plans and post-retirement benefit plans, respectively.
The company also sponsors defined contribution plans. For the three months ended March 31, 2014 and 2013, we made contributions of $73 million and $75 million, respectively, to these plans.