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Retirement Benefits (Unaudited)
 9 Months Ended
Sep. 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 September 30
Nine Months Ended September 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
$
112

 
$
121

 
$
8

 
$
8

$
335

 
$
363

 
$
23

 
$
26

Interest cost
321

 
306

 
24

 
24

963

 
918

 
71

 
71

Expected return on plan assets
(464
)
 
(494
)
 
(21
)
 
(22
)
(1,390
)
 
(1,481
)
 
(64
)
 
(67
)
Amortization of:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Prior service credit
(15
)
 
(15
)
 
(6
)
 
(7
)
(45
)
 
(45
)
 
(17
)
 
(21
)
Net loss from previous years
179

 
170

 
3

 
6

536

 
511

 
11

 
20

Net periodic benefit cost
$
133

 
$
88

 
$
8

 
$
9

$
399

 
$
266

 
$
24

 
$
29


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
2016
 
2015
 
2016
 
2015
Defined benefit pension plans
$
14

 
$
20

 
$
61

 
$
564

Medical and life benefit plans
17

 
19

 
46

 
44

Defined contribution plans
83

 
77

 
241

 
227