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Oncor-Related Transactions (Details) - USD ($)
Jul. 07, 2017
Oct. 31, 2016
Jul. 29, 2016
Energy Future Holdings Corp. [Member]      
Business Acquisition [Line Items]      
Percentage of interests to be acquired in pending merger     100.00%
Energy Future Holdings Corp., Texas Transmission Holdings Corporation, and Oncor Management Investment LLC [Member] | Oncor Electric Delivery Company LLC [Member]      
Business Acquisition [Line Items]      
Percentage of interests to be acquired in pending merger   100.00% 80.00%
Subsequent Event [Member] | Energy Future Holdings Corp., Texas Transmission Holdings Corporation, and Oncor Management Investment LLC [Member]      
Business Acquisition [Line Items]      
Termination fee sought $ 275,000,000