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Earnings per Share (Table)
 12 Months Ended
Dec. 31, 2018
Earnings Per Share Reconciliation [Abstract]  
Earnings per share reconciliation [Table Text Block]
The following is a reconciliation of the income and share data used in the basic and diluted earnings per share computations:
(for the year ended December 31, in millions, except per share amounts)
 
2018
 
2017
 
2016
Basic and Diluted
 
 
 
 
 
 
Net income, as reported
 
$
2,523

 
$
2,056

 
$
3,014

Participating share-based awards — allocated income
 
(19
)
 
(15
)
 
(22
)
Net income available to common shareholders — basic and diluted
 
$
2,504

 
$
2,041

 
$
2,992

Common Shares
 
 
 
 
 
 
Basic
 
 
 
 
 
 
Weighted average shares outstanding
 
267.4

 
276.0

 
288.1

Diluted
 
 
 
 
 
 
Weighted average shares outstanding
 
267.4

 
276.0

 
288.1

Weighted average effects of dilutive securities:
 
 
 
 
 
 
Stock options and performance shares
 
2.4

 
2.6

 
2.9

Total
 
269.8

 
278.6

 
291.0

Net income Per Common Share
 
 
 
 
 
 
Basic
 
$
9.37

 
$
7.39

 
$
10.39

Diluted
 
$
9.28

 
$
7.33

 
$
10.28