Quarterly report pursuant to Section 13 or 15(d)

Equity Method Investments - Summary of Consolidated Financial Position and Results of Operations of Significant Entities, Accounted for Using Equity Method (Details)

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Equity Method Investments - Summary of Consolidated Financial Position and Results of Operations of Significant Entities, Accounted for Using Equity Method (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Balance Sheet      
Current assets $ 335   $ 232
Total assets 4,356   4,179
Current liabilities 188   164
Total liabilities 1,428   1,216
Members’ equity 2,928   2,963
Income Statement      
Revenue 186 $ 138  
Income from continuing operations (20) 30  
Net income (20) 30  
Buckeye Wind Energy Class B Holdings, LLC [Member]      
Balance Sheet      
Current assets 3   4
Total assets 271   276
Current liabilities 1   1
Total liabilities 12   12
Members’ equity 259   264
Income Statement      
Revenue 7 7  
Income from continuing operations (2) (2)  
Net income (2) (2)  
Other Investments [Member]      
Balance Sheet      
Current assets 332   228
Total assets 4,085   3,903
Current liabilities 187   163
Total liabilities 1,416   1,204
Members’ equity 2,669   $ 2,699
Income Statement      
Revenue 179 131  
Income from continuing operations (18) 32  
Net income $ (18) $ 32