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Segment Information (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Segment Financial Information          
Revenues $ 3,309 $ 3,401 $ 6,861 $ 7,270  
Revenues [1] 3,309 3,401 6,861 7,270  
Depreciation 281 334 556 663  
Amortization of regulatory assets, net 65 63 124 124  
Impairment of assets (Note 14) 131 1,447 131 1,447  
Investment income 17 19 41 47  
Interest expense 290 289 577 577  
Income taxes (benefits) 117 (130) 243 83  
NET INCOME (LOSS) 174 (1,089) 379 (761)  
Total assets 43,327 51,401 43,327 51,401 $ 43,148
Goodwill 5,618 5,618 5,618 5,618 $ 5,618
Property additions 666 794 1,254 1,492  
Regulated Distribution          
Segment Financial Information          
Impairment of assets (Note 14) 0        
Regulated Transmission          
Segment Financial Information          
Impairment of assets (Note 14) 0        
Competitive Energy Services          
Segment Financial Information          
Impairment of assets (Note 14) 131        
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 2,262 2,189 4,752 4,699  
Revenues 2,262 2,189 4,752 4,699  
Depreciation 179 168 357 335  
Amortization of regulatory assets, net 62 61 119 120  
Impairment of assets (Note 14)   0 0 0  
Investment income 14 13 28 24  
Interest expense 134 148 272 298  
Income taxes (benefits) 121 80 259 174  
NET INCOME (LOSS) 205 139 442 297  
Total assets 27,660 27,448 27,660 27,448  
Goodwill 5,004 5,004 5,004 5,004  
Property additions 304 287 568 528  
Operating Segments | Regulated Transmission          
Segment Financial Information          
Revenues 327 275 640 561  
Revenues 327 275 640 561  
Depreciation 54 46 105 91  
Amortization of regulatory assets, net 3 2 5 4  
Impairment of assets (Note 14)   0 0 0  
Investment income 0 0 0 0  
Interest expense 39 39 78 79  
Income taxes (benefits) 53 46 105 93  
NET INCOME (LOSS) 92 78 180 159  
Total assets 9,142 8,314 9,142 8,314  
Goodwill 614 614 614 614  
Property additions 245 277 469 556  
Operating Segments | Competitive Energy Services          
Segment Financial Information          
Revenues 778 1,008 1,592 2,160  
Revenues 864 1,116 1,795 2,420  
Depreciation 29 103 57 205  
Amortization of regulatory assets, net 0 0 0 0  
Impairment of assets (Note 14)   1,447 131 1,447  
Investment income 12 18 32 33  
Interest expense 47 48 92 95  
Income taxes (benefits) (30) (230) (65) (145)  
NET INCOME (LOSS) (56) (1,259) (123) (1,115)  
Total assets 5,887 15,464 5,887 15,464  
Goodwill 0 0 0 0  
Property additions 96 213 188 382  
Corporate/Other          
Segment Financial Information          
Revenues 0 0 0 0  
Revenues 0 0 0 0  
Depreciation 19 17 37 32  
Amortization of regulatory assets, net 0 0 0 0  
Impairment of assets (Note 14)   0 0 0  
Investment income 2 0 5 11  
Interest expense 70 54 135 105  
Income taxes (benefits) (27) (26) (56) (39)  
NET INCOME (LOSS) (67) (47) (120) (102)  
Total assets 638 175 638 175  
Goodwill 0 0 0 0  
Property additions 21 17 29 26  
Intersegment Eliminations          
Segment Financial Information          
Revenues (86) (108) (203) (260)  
Intersegment Eliminations | Competitive Energy Services          
Segment Financial Information          
Revenues 86 108 203 260  
Reconciling Adjustments          
Segment Financial Information          
Revenues (58) (71) (123) (150)  
Revenues (144) (179) (326) (410)  
Depreciation 0 0 0 0  
Amortization of regulatory assets, net 0 0 0 0  
Impairment of assets (Note 14)   0 0 0  
Investment income (11) (12) (24) (21)  
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 $91 million and $92 million in the three months ended June 30, 2017 and 2016, respectively, and $191 million and $199 million in the six months ended June 30, 2017 and 2016, respectively.