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Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2011
Quarterly Financial Data [Abstract]  
Schedule of Quarterly Financial Information
 
Quarter
 
1st
 
2nd
 
3rd
 
4th
 
(in millions, except per share amounts)
2011
 
 
 
 
 
 
 
Net operating revenues
$
8,313

 
$
8,311

 
$
8,333

 
$
8,722

Operating income (loss)
259

 
79

 
208

 
(438
)
Net loss
(439
)
 
(847
)
 
(301
)
 
(1,303
)
Basic and diluted loss per common share(1) 
(0.15
)
 
(0.28
)
 
(0.10
)
 
(0.43
)
 
Quarter
 
1st
 
2nd
 
3rd
 
4th
 
(in millions, except per share amounts)
2010
 
 
 
 
 
 
 
Net operating revenues
$
8,085

 
$
8,025

 
$
8,152

 
$
8,301

Operating loss
(180
)
 
(63
)
 
(213
)
 
(139
)
Net loss
(865
)
 
(760
)
 
(911
)
 
(929
)
Basic and diluted loss per common share(1) 
(0.29
)
 
(0.25
)
 
(0.30
)
 
(0.31
)

_____________
(1)
The sum of the quarterly earnings per share amounts may not equal the annual amounts because of the changes in the weighted average number of shares outstanding during the year.