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Variable Interest Entities - Net Assets of Texas Solar 4 (Details) - Texas Solar 4 - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]    
Restricted cash $ 8 $ 9
Receivable from parent company 35 32
Non-utility property, less accumulated depreciation of $9 and $5, respectively 104 107
Other assets 8 11
Total assets 155 159
Long-term debt due within one year 3 2
Other liabilities 38 37
Long-term debt 60 62
Total liabilities 101 101
Accumulated depreciation $ 9 $ 5