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Discontinued Operations and Dispositions (Tables)
 3 Months Ended
Mar. 31, 2019
Discontinued Operations and Disposal Groups [Abstract]  
Summary of Results of Discontinued Operations and Major Classes of Assets and Liabilities
Summarized results of the South Central Portfolio discontinued operations were as follows:    
 
Three months ended
(In millions)
March 31, 2019
 
March 31, 2018
Operating revenues
$
31

 
$
102

Operating costs and expenses
(23
)
 
(86
)
Gain from discontinued operations, net of tax
8

 
16

Gain on disposal of discontinued operations, net of tax
27

 
—

Gain from discontinued operations, including disposal, net of tax
$
35

 
$
16

The following table summarizes the major classes of assets and liabilities classified as discontinued operations of the South Central Portfolio:
(In millions)
 
December 31, 2018
Cash and cash equivalents
 
$
89

Accounts receivable, net - trade
 
49

Inventory
 
35

Other current assets
 
5

Current assets - discontinued operations
 
178

Property, plant and equipment, net
 
408

Other non-current assets
 
1

Non-current assets - discontinued operations
 
409

Accounts payable
 
19

Other current liabilities
 
5

Current liabilities - discontinued operations
 
24

Out-of-market contracts, net
 
50

Other non-current liabilities
 
11

Non-current liabilities - discontinued operations
 
$
61

Summarized results of NRG Yield, Inc. and the Renewables Platform and Carlsbad discontinued operations were as follows:    
 
Three months ended
(In millions)
March 31, 2019
 
March 31, 2018
Operating revenues
$
19

 
$
260

Operating costs and expenses
(9
)
 
(230
)
Other expenses
(5
)
 
(58
)
Gain/(loss) from operations of discontinued components, before tax
5

 
(28
)
Income tax benefit
—

 
(7
)
Gain/(loss) from discontinued operations, net of tax
5

 
(21
)
Gain on disposal of discontinued operations, net of tax
348

 
—

Gain/(loss) from discontinued operations, including disposal, net of tax
$
353

 
$
(21
)
The following table summarizes the major classes of assets and liabilities classified as discontinued operations of Carlsbad:
(In millions)
 
December 31, 2018
Restricted cash
 
$
4

Accounts receivable, net - trade
 
10

Other current assets
 
5

Current assets - discontinued operations
 
19

Property, plant and equipment, net
 
590

Intangible assets, net
 
9

Other non-current assets
 
4

Non-current assets - discontinued operations
 
603

Current portion of long-term debt and capital leases
 
20

Accounts payable
 
27

Other current liabilities
 
1

Current liabilities - discontinued operations
 
48

Long-term debt and capital leases
 
572

Other non-current liabilities
 
2

Non-current liabilities - discontinued operations
 
$
574