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Discontinued Operations and Held-For-Sale Businesses (Tables)
 12 Months Ended
Dec. 31, 2014
Discontinued Operations and Disposal Groups [Abstract]  
Revenue Income From Operations Of Discontinued Businesses Income Tax Expense And Impairment Of Discontinued Operations
The following table summarizes the revenue, income from operations, income tax expense, impairment and loss on disposal of all discontinued operations prior to the adoption of the new accounting guidance for discontinued operations for the periods indicated:
 
 
Years Ended December 31,
 
 
2014
 
2013
 
2012
 
 
(in millions)
Revenue
 
$
233

 
$
689

 
$
1,043

Income (loss) from operations of discontinued businesses, before income tax
 
$
50

 
$
(3
)
 
$
73

Income tax expense
 
(23
)
 
(24
)
 
(26
)
Income (loss) from operations of discontinued businesses, after income tax
 
$
27

 
$
(27
)
 
$
47

Net gain (loss) from disposal and impairments of discontinued businesses, after income tax
 
$
(56
)
 
$
(152
)
 
$
16