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Retirement Benefits (Unaudited)
 9 Months Ended
Sep. 30, 2014
Compensation and Retirement Disclosure [Abstract]  
RETIREMENT BENEFITS
RETIREMENT BENEFITS
The cost to the company of its defined benefit 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
2014
 
2013
 
2014
 
2013
2014
 
2013
 
2014
 
2013
Components of net periodic benefit cost
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
114

 
$
129

 
$
8

 
$
9

$
343

 
$
387

 
$
25

 
$
27

Interest cost
314

 
279

 
25

 
24

944

 
838

 
75

 
72

Expected return on plan assets
(467
)
 
(452
)
 
(21
)
 
(19
)
(1,402
)
 
(1,357
)
 
(63
)
 
(57
)
Amortization of:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Prior service credit
(14
)
 
(15
)
 
(12
)
 
(13
)
(44
)
 
(44
)
 
(32
)
 
(38
)
Net loss from previous years
81

 
152

 
3

 
8

245

 
456

 
9

 
23

Other
1

 
—

 
—

 
—

1

 
—

 
—

 
—

Net periodic benefit cost
$
29

 
$
93

 
$
3

 
$
9

$
87

 
$
280

 
$
14

 
$
27


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 nine months ended September 30, 2014, we made contributions of $59 million and $43 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 September 30, 2014 and 2013, we made contributions of $63 million and $63 million, respectively, to these plans. For the nine months ended September 30, 2014 and 2013, we made contributions of $210 million and $213 million, respectively, to these plans.