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Basis of Presentation and Summary of Significant Accounting Policies (Tables)
3 Months Ended
Mar. 31, 2014
Basis Of Presentation And Summary Of Significant Accounting Policies Tables [Abstract]  
Reconciliation from Basic to Diluted Shares [Table Text Block]
   Three Months Ended
   March 31,
 (in millions) 2014 2013
 Weighted average shares for basic EPS 585  621 
 Dilutive effect of shares issuable under stock-based      
  compensation plans 15  17 
 Weighted average shares for diluted EPS 600  638