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Acquisitions, Discontinued Operations and Dispositions - Major Classes of Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Current assets - discontinued operations $ 0 $ 197
Non-current assets - discontinued operations 0 1,012
Current liabilities - discontinued operations 0 72
Other non-current liabilities   65
Non-current liabilities - discontinued operations $ 0 635
South Central Portfolio | Discontinued Operations    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Cash and cash equivalents   89
Accounts receivable, net   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
Carlsbad Energy Holdings LLC | Discontinued Operations    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Restricted Cash   4
Accounts receivable, net   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