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Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2015
Accounting Policies [Abstract]  
Research and Development
($ in millions)
2015
 
2014
 
2013
Research and development – total
$
505

 
$
509

 
$
479

Less depreciation on research facilities
19

 
17

 
16

Research and development, net
$
486

 
$
492

 
$
463