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Share Repurchase Programs (Tables)
 12 Months Ended
Dec. 31, 2016
Equity [Abstract]  
Summary of Annual Stock Repurchased
The table below summarizes annual share repurchase activity under these plans (in millions, except per share amounts):
 
 
 
 
 
 
Total cost of shares
 
 
 
 
 
 
purchased as part of
 
 
Total number of
 
Average price
 
publicly announced
Year ended
 
shares purchased
 
paid per share
 
plans or programs
December 31, 2016
 
—

 
$
—

 
$
—

December 31, 2015
 
5

 
$
66.10

 
$
300

December 31, 2014
 
9

 
$
54.89

 
$
476