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Discontinued Operations and Dispositions (Tables)
 3 Months Ended
Mar. 31, 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 March 31, 2017
(In millions)
Operating revenues
$
381

Operating costs and expenses
(373
)
Other expenses
(44
)
Loss from operations of discontinued components, before tax
(36
)
Income tax expense
1

Loss from operations of discontinued components
(37
)
Interest income - affiliate
3

Loss from discontinued operations, net of tax
$
(34
)