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Earnings per Share (table)
12 Months Ended
Dec. 31, 2017
Earnings per Share disclosure  
Earnings per share reconciliation [Table Text Block]

(for the year ended December 31, in millions, except per share amounts)
  2017   2016   2015  

Basic and Diluted

                   

Net income, as reported

  $ 2,056   $ 3,014   $ 3,439  

Participating share-based awards—allocated income

    (15 )   (22 )   (25 )

Net income available to common shareholders—basic and diluted

  $ 2,041   $ 2,992   $ 3,414  

Common Shares

                   

Basic

                   

Weighted average shares outstanding

    276.0     288.1     310.6  

Diluted

                   

Weighted average shares outstanding

    276.0     288.1     310.6  

Weighted average effects of dilutive securities:

                   

Stock options and performance shares

    2.6     2.9     3.3  

Total

    278.6     291.0     313.9  

Net income Per Common Share

                   

Basic

  $ 7.39   $ 10.39   $ 10.99  

Diluted

  $ 7.33   $ 10.28   $ 10.88