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Basic and Diluted Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2013
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
The following table summarizes the calculation of basic and diluted earnings per share:
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
2013
 
2012
 
2013
 
2012
(millions, except per share amounts)
 
 
 
 
 
 
 
Income from Continuing Operations
$
195

 
$
164

 
$
785

 
$
687

Earnings Adjustment from Assumed Conversion of Dilutive Shares of Common Stock in Rabbi Trust (1)
—

 
—

 
—

 
(1
)
Income from Continuing Operations Used for Diluted Earnings Per Share Calculation
$
195

 
$
164

 
$
785

 
$
686

 
 
 
 
 
 
 
 
Weighted Average Number of Shares Outstanding, Basic
359

 
356

 
359

 
356

Incremental Shares From Assumed Conversion of Dilutive Stock Options, Restricted Stock and Shares of Common Stock in Rabbi Trust
4

 
3

 
4

 
5

Weighted Average Number of Shares Outstanding, Diluted
363

 
359

 
363

 
361

Earnings from Continuing Operations Per Share, Basic
$
0.54

 
$
0.46

 
$
2.19

 
$
1.93

Earnings from Continuing Operations Per Share, Diluted
0.53

 
0.45

 
2.17

 
1.90

Number of antidilutive stock options, shares of restricted stock and shares of common stock in rabbi trust excluded from calculation above
4

 
6

 
5

 
4

(1) 
Consistent with GAAP, when dilutive, deferred compensation gains or losses, net of tax, are excluded from net income while our common shares held in the rabbi trust are included in the diluted share count. For this reason, the diluted earnings per share calculation for the nine months ended September 30, 2012 excludes deferred compensation gains.