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Quarterly Financial Data (Tables)
 12 Months Ended
Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract]  
Summarized Financial Data
Unaudited summarized financial data by quarter for 2012 and 2011 (in millions, except per share amounts):


 
 
First
    Quarter     
 
Second
    Quarter    
 
Third
    Quarter    
 
Fourth
    Quarter    
2012
 
 
 
 
 
 
 
 
Operating revenues
 
$
6,031

 
$
6,447

 
$
6,422

 
$
5,925

Operating income (loss)
 
(101
)
 
122

 
27

 
(7
)
Net earnings (loss)
 
(1,676
)
 
(264
)
 
(257
)
 
271

2011
 
 
 
 
 
 
 
 
Operating revenues
 
$
5,527

 
$
6,109

 
$
6,371

 
$
5,950

Operating income (loss)
 
(266
)
 
(116
)
 
10

 
(798
)
Net earnings (loss)
 
(431
)
 
(284
)
 
(153
)
 
(1,097
)