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Acquisitions, Discontinued Operations and Dispositions - Major Classes of Assets and Liabilities Classified as Discontinued Operations (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Other current assets $ 0 $ 116
Current assets - discontinued operations 4 705
Other non-current assets 0 43
Non-current assets - discontinued operations 560 10,181
Current liabilities - discontinued operations 52 864
Other non-current liabilities 0 8
Non-current liabilities - discontinued operations 547 6,859
Carlsbad Project | Discontinued Operations    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Cash and cash equivalents 0  
Restricted Cash 0  
Accounts receivable, net 0  
Other current assets 4  
Current assets - discontinued operations 4  
Property, plant and equipment, net 547  
Equity investments in affiliates 0  
Intangible assets, net 8  
Other non-current assets 5  
Non-current assets - discontinued operations 560  
Current portion of long term debt and capital leases 14  
Accounts payable 37  
Other current liabilities 1  
Current liabilities - discontinued operations 52  
Long-term debt and capital leases 545  
Other non-current liabilities 2  
Non-current liabilities - discontinued operations $ 547  
Renewables And Carlsbad Project | Discontinued Operations    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Cash and cash equivalents   224
Restricted Cash   229
Accounts receivable, net   119
Other current assets   133
Current assets - discontinued operations   705
Property, plant and equipment, net   7,473
Equity investments in affiliates   856
Intangible assets, net   1,240
Other non-current assets   612
Non-current assets - discontinued operations   10,181
Current portion of long term debt and capital leases   484
Accounts payable   169
Other current liabilities   211
Current liabilities - discontinued operations   864
Long-term debt and capital leases   6,673
Other non-current liabilities   186
Non-current liabilities - discontinued operations   $ 6,859