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Acquisitions, Discontinued Operations and Dispositions - Major Classes of Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Other current assets $ 1 $ 116
Current assets - discontinued operations 197 744
Other non-current assets 77 43
Non-current assets - discontinued operations 1,012 10,506
Current liabilities - discontinued operations 72 846
Other non-current liabilities 65 8
Non-current liabilities - discontinued operations 635 6,798
Zephyr Renewables And Carlsbad Energy Holdings LLC [Member] | Discontinued Operations    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Cash and cash equivalents 0 224
Restricted Cash 4 229
Accounts receivable, net 10 119
Other current assets 5 81
Current assets - discontinued operations 19 653
Property, plant and equipment, net 590 7,473
Equity investments in affiliates 0 856
Intangible assets, net 9 1,240
Other non-current assets 4 475
Non-current assets - discontinued operations 603 10,044
Current portion of long term debt and capital leases 20 484
Accounts payable 27 169
Other current liabilities 1 159
Current liabilities - discontinued operations 48 812
Long-term debt and capital leases 572 6,536
Other non-current liabilities 2 186
Non-current liabilities - discontinued operations 574 6,722
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 (3)
Accounts receivable, net 49 61
Inventory 35 33
Other current assets 5 0
Current assets - discontinued operations 178 91
Property, plant and equipment, net 408 461
Other non-current assets 1 1
Non-current assets - discontinued operations 409 462
Accounts payable 19 28
Other current liabilities 5 6
Current liabilities - discontinued operations 24 34
Out-of-market contracts 50 66
Other non-current liabilities 11 10
Non-current liabilities - discontinued operations $ 61 $ 76