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Quarterly Financial Data (Unaudited) (Tables)
12 Months Ended
Dec. 31, 2013
Quarterly Financial Data [Abstract]  
Schedule of quarterly financial information
Quarterly Financial Data
2013
 
 
 
 
 
 
 
 
 
(In millions, except per share data)
First
 
Second
 
Third
 
Fourth
 
Full Year
Revenues
$
2,503

 
$
2,493

 
$
2,504

 
$
2,613

 
$
10,113

Net income (loss) attributable to CNA
$
250

 
$
194

 
$
272

 
$
221

 
$
937

Basic earnings (loss) per share attributable to CNA common stockholders
$
0.93

 
$
0.72

 
$
1.01

 
$
0.82

 
$
3.48

Diluted earnings (loss) per share attributable to CNA common stockholders (a)
$
0.93

 
$
0.72

 
$
1.01

 
$
0.82

 
$
3.47


2012
 
 
 
 
 
 
 
 
 
(In millions, except per share data)
First
 
Second
 
Third
 
Fourth
 
Full Year
Revenues
$
2,401

 
$
2,246

 
$
2,466

 
$
2,434

 
$
9,547

Net income (loss) attributable to CNA
$
250

 
$
166

 
$
221

 
$
(9
)
 
$
628

Basic and diluted earnings (loss) per share attributable to CNA common stockholders (a)
$
0.93

 
$
0.62

 
$
0.82

 
$
(0.03
)
 
$
2.33


____________________
(a)
Due to the averaging of shares, quarterly earnings per share do not add to the total for the full year.