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Earnings per Share (Table)
 6 Months Ended
Jun. 30, 2018
Earnings Per Share Reconciliation [Abstract]  
Earnings per share reconciliation [Table Text Block]
 
The following is a reconciliation of the net income and share data used in the basic and diluted earnings per share computations for the periods presented:
 
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
(in millions, except per share amounts)
 
2018
 
2017
 
2018
 
2017
 
 
 
 
 
 
 
 
 
Basic and Diluted
 
 
 
 
 
 

 
 

Net income, as reported
 
$
524

 
$
595

 
$
1,193

 
$
1,212

Participating share-based awards — allocated income
 
(4
)
 
(5
)
 
(9
)
 
(9
)
Net income available to common shareholders — basic and diluted
 
$
520

 
$
590

 
$
1,184

 
$
1,203

 
 
 
 
 
 
 
 
 
Common Shares
 
 
 
 
 
 

 
 

Basic
 
 
 
 
 
 

 
 

Weighted average shares outstanding
 
268.7

 
277.5

 
269.8

 
278.6

 
 
 
 
 
 
 
 
 
Diluted
 
 
 
 
 
 

 
 

Weighted average shares outstanding
 
268.7

 
277.5

 
269.8

 
278.6

Weighted average effects of dilutive securities — stock options and performance shares
 
2.4

 
2.5

 
2.7

 
2.6

Total
 
271.1

 
280.0

 
272.5

 
281.2

 
 
 
 
 
 
 
 
 
Net Income per Common Share
 
 
 
 
 
 

 
 

Basic
 
$
1.93

 
$
2.13

 
$
4.39

 
$
4.32

Diluted
 
$
1.92

 
$
2.11

 
$
4.35

 
$
4.28