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Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2016
Accounting Policies [Abstract]  
Research and Development
($ in millions)
2016
 
2015
 
2014
Research and development – total
$
487

 
$
494

 
$
499

Less depreciation on research facilities
21

 
18

 
16

Research and development, net
$
466

 
$
476

 
$
483