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Acquisitions, Discontinued Operations and Dispositions (Tables)
 6 Months Ended
Jun. 30, 2018
Discontinued Operations and Disposal Groups [Abstract]  
Summary of results of discontinued operations and major classes of assets and liabilities
Summarized results of discontinued operations were as follows:
 
Three months ended June 30, 2018
 
Period from April 1, 2017 through June 14, 2017
 
Six months ended June 30, 2018
 
Period from January 1, 2017 through June 14, 2017
(In millions)
 
 
 
Operating revenues
$
—

 
$
265

 
$
—

 
$
646

Operating costs and expenses
—

 
(327
)
 
—

 
(700
)
Other expenses
—

 
(54
)
 
—

 
(98
)
Loss from operations of discontinued components, before tax
—

 
(116
)
 
—

 
(152
)
Income tax expense
—

 
8

 
—

 
9

Loss from operations of discontinued components
—

 
(124
)
 
—

 
(161
)
Interest income - affiliate
2

 
3

 
3

 
6

Loss from operations of discontinued components, net of tax
2

 
(121
)
 
3

 
(155
)
Pre-tax loss on deconsolidation
—

 
(208
)
 
—

 
(208
)
Settlement consideration and services credit
—

 
(289
)
 
—

 
(289
)
Pension and post-retirement liability assumption
1

 
(119
)
 
1

 
(119
)
Advisory and consulting fees
(1
)
 
(4
)
 
(2
)
 
(4
)
Other
(27
)
 
—

 
(27
)
 
—

Loss on disposal of discontinued components, net of tax
(27
)
 
(620
)
 
(28
)
 
(620
)
Loss from discontinued operations, net of tax
$
(25
)
 
$
(741
)
 
$
(25
)
 
$
(775
)