XML 57 R28.htm IDEA: XBRL DOCUMENT v2.4.1.9
Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2014
Accounting Policies [Abstract]  
Research and Development
The following are the research and development costs for the years ended December 31:
($ in millions)
2014
 
2013
 
2012
Research and development – total
$
509

 
$
479

 
$
444

Less depreciation on research facilities
17

 
16

 
14

Research and development, net
$
492

 
$
463

 
$
430