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Shareholders' Equity and Dividend Availability (table)
 12 Months Ended
Dec. 31, 2017
Shareholders' Equity and Dividend Availability disclosure  
Share repurchase activity and remaining repurchase capacity under the share repurchase authorization [Table Text Block]

(in millions, except per share amounts)
Quarterly Period Ending
  Number of
shares
repurchased		   Cost of
shares
repurchased		   Average price
paid per share		   Remaining capacity
under share repurchase
authorization		  

March 31, 2017

     1.9   $ 225   $ 120.86   $ 709  

June 30, 2017

     3.8     475     123.04     5,234  

September 30, 2017

     2.6     328     128.11     4,906  

December 31, 2017

     2.6     350     133.70     4,556  
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Total

     10.9   $ 1,378     126.42     4,556  
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