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Retirement Benefits (Unaudited)
 6 Months Ended
Jun. 30, 2017
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 June 30
Six Months Ended June 30
 
Pension
Benefits
 
Medical and
Life Benefits
Pension
Benefits
 
Medical and
Life Benefits
$ in millions
2017
 
2016
 
2017
 
2016
2017
 
2016
 
2017
 
2016
Components of net periodic benefit cost
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
114

 
$
111

 
$
7

 
$
7

$
228

 
$
223

 
$
13

 
$
15

Interest cost
308

 
321

 
21

 
23

617

 
642

 
42

 
47

Expected return on plan assets
(472
)
 
(463
)
 
(23
)
 
(22
)
(943
)
 
(926
)
 
(45
)
 
(43
)
Amortization of:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Prior service credit
(14
)
 
(15
)
 
(6
)
 
(5
)
(29
)
 
(30
)
 
(11
)
 
(11
)
Net loss from previous years
178

 
179

 
3

 
5

356

 
357

 
5

 
8

Net periodic benefit cost
$
114

 
$
133

 
$
2

 
$
8

$
229

 
$
266

 
$
4

 
$
16


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, including making voluntary contributions from time to time.
Contributions made by the company to its retirement plans are as follows:
 
Three Months Ended June 30
 
Six Months Ended June 30
$ in millions
2017
 
2016
 
2017
 
2016
Defined benefit pension plans
$
28

 
$
20

 
$
51

 
$
47

Medical and life benefit plans
13

 
18

 
24

 
29

Defined contribution plans
77

 
71

 
176

 
158