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Business and Basis of Presentation Correction of an Error in Prior Periods (Tables)
 6 Months Ended
Jun. 30, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of Error Corrections and Prior Period Adjustments
The following tables show the impact of the error correction to the three and six months ended June 30, 2013.
 
 
Three Months Ended June 30, 2013
Consolidated Statement of Comprehensive Income (Loss)
 
As Reported
 
Correction
 
As Revised
 
 
(in millions, except per share amounts)
Operating revenue
 
$
345

 
$
(10
)
 
$
335

Operating income (loss)
 
(136
)
 
(10
)
 
(146
)
Provision (benefit) for income taxes
 
(148
)
 
(9
)
 
(157
)
Net income (loss)
 
(68
)
 
(1
)
 
(69
)
Comprehensive income (loss)
 
(75
)
 
(1
)
 
(76
)
Basic and diluted earnings (loss) per common share
 
(4.56
)
 
(0.02
)
 
(4.58
)

 
 
Six Months Ended June 30, 2013
Consolidated Statement of Comprehensive Income (Loss)
 
As Reported
 
Correction
 
As Revised
 
 
(in millions, except per share amounts)
Operating revenue
 
$
633

 
$
(10
)
 
$
623

Operating income (loss)
 
(117
)
 
(10
)
 
(127
)
Provision (benefit) for income taxes
 
(149
)
 
(9
)
 
(158
)
Net income (loss)
 
(127
)
 
(1
)
 
(128
)
Comprehensive income (loss)
 
(133
)
 
(1
)
 
(134
)
Basic and diluted earnings (loss) per common share
 
(10.08
)
 
(0.04
)
 
(10.12
)

 
 
Six Months Ended June 30, 2013
Consolidated Statement of Cash Flows
 
As Reported
 
Correction
 
As Revised
 
 
(in millions)
Net (loss)
 
$
(127
)
 
$
(1
)
 
$
(128
)
Provision (benefit) for deferred income taxes
 
(151
)
 
(9
)
 
(160
)
Change in accounts payable and accrued liabilities
 
(5
)
 
10

 
5

Net cash provided by operating activities
 
139

 
—

 
139