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Income Taxes (Tables)
 9 Months Ended
Sep. 30, 2017
Income Tax Disclosure [Abstract]  
Income Tax Allocation
Income Tax Allocation
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
(Dollars in millions)
2017
 
2016
 
2017
 
2016
Loss from continuing operations, before income taxes
$
(480
)
 
$
(3,261
)
 
$
(2,327
)
 
$
(5,626
)
Income tax benefit/(provision)
$
20

 
$
(27
)
 
$
(83
)
 
$
(37
)
Effective tax rate
4.2
%
 
(0.8
)%
 
(3.6
)%
 
(0.7
)%
 
 
 
 
 
 
 
 
Discontinued operations, before income taxes
$
—

 
$
3,973

 
$
—

 
$
4,091

Income tax provision
$
—

 
$
(680
)
 
$
—

 
$
(740
)