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Retirement Benefits (Unaudited) (Tables)
 3 Months Ended
Mar. 31, 2017
Compensation and Retirement Disclosure [Abstract]  
Components of net periodic benefit cost
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
2017
 
2016
 
2017
 
2016
Components of net periodic benefit cost
 
 
 
 
 
 
 
Service cost
$
114

 
$
112

 
$
6

 
$
8

Interest cost
309

 
321

 
21

 
24

Expected return on plan assets
(471
)
 
(463
)
 
(22
)
 
(21
)
Amortization of:
 
 
 
 
 
 
 
Prior service credit
(15
)
 
(15
)
 
(5
)
 
(6
)
Net loss from previous years
178

 
178

 
2

 
3

Net periodic benefit cost
$
115

 
$
133

 
$
2

 
$
8
Employer contributions to retirement plans
Contributions made by the company to its retirement plans are as follows:
 
Three Months Ended March 31
$ in millions
2017
 
2016
Defined benefit pension plans
$
23

 
$
27

Medical and life benefit plans
11

 
11

Defined contribution plans
99

 
87