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Segment Information (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Segment Financial Information          
Revenues $ 3,714 $ 3,917 $ 10,575 $ 11,187  
Revenues [1] 3,714 3,917 10,575 11,187  
Depreciation 289 311 845 974  
Amortization of regulatory assets, net 91 98 215 222  
Impairment of assets (Note 14) 31 0 162 1,447  
Investment income 37 28 78 75  
Interest expense 305 286 882 863  
Income taxes (benefits) 239 251 482 334  
NET INCOME (LOSS) 396 380 775 (381)  
Total assets 43,649 51,961 43,649 51,961 $ 43,148
Goodwill 5,618 5,618 5,618 5,618 $ 5,618
Property additions 593 664 1,847 2,156  
Regulated Distribution          
Segment Financial Information          
Impairment of assets (Note 14) 0        
Regulated Transmission          
Segment Financial Information          
Impairment of assets (Note 14) 13        
Competitive Energy Services          
Segment Financial Information          
Impairment of assets (Note 14) 18        
Other Business Operations [Member]          
Segment Financial Information          
Impairment of assets (Note 14) 0        
Reconciling Adjustments [Member]          
Segment Financial Information          
Impairment of assets (Note 14) 0        
Operating Segments | Regulated Distribution          
Segment Financial Information          
Revenues 2,610 2,691 7,362 7,390  
Revenues 2,610 2,691 7,362 7,390  
Depreciation 183 169 540 504  
Amortization of regulatory assets, net 85 98 204 218  
Impairment of assets (Note 14)     0 0  
Investment income 13 13 41 37  
Interest expense 133 143 405 441  
Income taxes (benefits) 183 162 442 336  
NET INCOME (LOSS) 314 276 756 573  
Total assets 27,866 27,818 27,866 27,818  
Goodwill 5,004 5,004 5,004 5,004  
Property additions 286 281 854 809  
Operating Segments | Regulated Transmission          
Segment Financial Information          
Revenues 342 294 982 851  
Revenues 342 294 982 851  
Depreciation 59 47 164 138  
Amortization of regulatory assets, net 6 0 11 4  
Impairment of assets (Note 14)     13 0  
Investment income 0 0 0 0  
Interest expense 38 39 116 118  
Income taxes (benefits) 49 50 154 143  
NET INCOME (LOSS) 84 85 264 244  
Total assets 9,356 8,492 9,356 8,492  
Goodwill 614 614 614 614  
Property additions 248 268 717 824  
Operating Segments | Competitive Energy Services          
Segment Financial Information          
Revenues 796 998 2,388 3,158  
Revenues 889 1,115 2,684 3,535  
Depreciation 30 79 87 284  
Amortization of regulatory assets, net 0 0 0 0  
Impairment of assets (Note 14)     149 1,447  
Investment income 34 23 66 56  
Interest expense 44 48 136 143  
Income taxes (benefits) 40 49 (25) (96)  
NET INCOME (LOSS) 66 86 (57) (1,029)  
Total assets 5,814 15,165 5,814 15,165  
Goodwill 0 0 0 0  
Property additions 45 110 233 492  
Corporate/Other          
Segment Financial Information          
Revenues 0 0 0 0  
Revenues 0 0 0 0  
Depreciation 17 16 54 48  
Amortization of regulatory assets, net 0 0 0 0  
Impairment of assets (Note 14)     0 0  
Investment income 3 2 8 13  
Interest expense 90 56 225 161  
Income taxes (benefits) (33) (10) (89) (49)  
NET INCOME (LOSS) (68) (67) (188) (169)  
Total assets 613 486 613 486  
Goodwill 0 0 0 0  
Property additions 14 5 43 31  
Intersegment Eliminations          
Segment Financial Information          
Revenues (93) (117) (296) (377)  
Intersegment Eliminations | Competitive Energy Services          
Segment Financial Information          
Revenues 93 117 296 377  
Reconciling Adjustments          
Segment Financial Information          
Revenues (34) (66) (157) (212)  
Revenues (127) (183) (453) (589)  
Depreciation 0 0 0 0  
Amortization of regulatory assets, net 0 0 0 0  
Impairment of assets (Note 14)     0 0  
Investment income (13) (10) (37) (31)  
Interest expense 0 0 0 0  
Income taxes (benefits) 0 0 0 0  
NET INCOME (LOSS) 0 0 0 0  
Total assets 0 0 0 0  
Goodwill 0 0 0 0  
Property additions $ 0 $ 0 $ 0 $ 0  
[1] Includes excise tax collections of $102 million and $111 million in the three months ended September 30, 2017 and 2016, respectively, and $293 million and $310 million in the nine months ended September 30, 2017 and 2016, respectively.