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Earnings per Share (Table)
 9 Months Ended
Sep. 30, 2019
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
September 30,
 
Nine Months Ended
September 30,
(in millions, except per share amounts)
 
2019
 
2018
 
2019
 
2018
 
 
 
 
 
 
 
 
 
Basic and Diluted
 
 
 
 
 
 

 
 

Net income, as reported
 
$
396

 
$
709

 
$
1,749

 
$
1,902

Participating share-based awards — allocated income
 
(3
)
 
(5
)
 
(12
)
 
(14
)
Net income available to common shareholders — basic and diluted
 
$
393

 
$
704

 
$
1,737

 
$
1,888

 
 
 
 
 
 
 
 
 
Common Shares
 
 
 
 
 
 

 
 

Basic
 
 
 
 
 
 

 
 

Weighted average shares outstanding
 
259.2

 
266.1

 
261.1

 
268.6

 
 
 
 
 
 
 
 
 
Diluted
 
 
 
 
 
 

 
 

Weighted average shares outstanding
 
259.2

 
266.1

 
261.1

 
268.6

Weighted average effects of dilutive securities — stock options and performance shares
 
2.6

 
2.3

 
2.3

 
2.5

Total
 
261.8

 
268.4

 
263.4

 
271.1

 
 
 
 
 
 
 
 
 
Net Income per Common Share
 
 
 
 
 
 

 
 

Basic
 
$
1.52

 
$
2.65

 
$
6.65

 
$
7.03

Diluted
 
$
1.50

 
$
2.62

 
$
6.59

 
$
6.97