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Discontinued Operations and Dispositions (Tables)
 3 Months Ended
Mar. 31, 2020
Discontinued Operations and Disposal Groups [Abstract]  
Summary of Results of Discontinued Operations
Summarized results of the South Central Portfolio discontinued operations were as follows: 
Three months ended
(In millions)March 31, 2019
Operating revenues$31  
Operating costs and expenses(23) 
Gain from operations of discontinued components8  
Gain on disposal of discontinued operations, net of tax27  
Gain from discontinued operations, including disposal, net of tax$35  
Summarized results of Carlsbad discontinued operations were as follows: 
Three months ended
(In millions)March 31, 2019
Operating revenues$19  
Operating costs and expenses(9) 
Other expenses(5) 
Gain from operations of discontinued components5  
Gain on disposal of discontinued operations, net of tax348  
Gain from discontinued operations, including disposal, net of tax$353