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Variable Interest Entities - Net Assets of Texas Solar 4 (Details) - Texas Solar 4 - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Business Acquisition [Line Items]    
Restricted cash $ 9 $ 13
Receivable from parent company 32 0
Non-utility property, less accumulated depreciation of $5 and $1, respectively 107 108
Other assets 11 14
Total assets 159 135
Long-term debt due within one year 2 66
Other liabilities 37 11
Long-term debt 62 0
Total liabilities 101 77
Depreciation $ 5 $ 1