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
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Balance Sheet      
Current assets $ 191   $ 233
Total assets 4,175   4,192
Current liabilities 119   164
Total liabilities 1,216   1,216
Members’ equity 2,959   2,976
Income Statement      
Revenue 90 $ 66  
Income from continuing operations (1) 4  
Net income (1) 4  
Buckeye Wind Energy Class B Holdings, LLC [Member]      
Balance Sheet      
Current assets 3   4
Total assets 274   276
Current liabilities 1   1
Total liabilities 12   12
Members’ equity 262   264
Income Statement      
Revenue 3 4  
Income from continuing operations (1) (1)  
Net income (1) (1)  
Other Investments [Member]      
Balance Sheet      
Current assets 188   229
Total assets 3,901   3,916
Current liabilities 118   163
Total liabilities 1,204   1,204
Members’ equity 2,697   $ 2,712
Income Statement      
Revenue 87 62  
Income from continuing operations 0 5  
Net income $ 0 $ 5