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Segment Information (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Segment Financial Information          
Revenues $ 3,401 $ 3,465 $ 7,270 $ 7,362  
Revenues [1] 3,401 3,465 7,270 7,362  
Depreciation 334 322 663 641  
Amortization of regulatory assets, net 63 59 124 91  
Impairment of assets 1,447 16 1,447 16  
Investment income (loss) 19 (3) 47 14  
Interest expense 289 282 577 561  
Income taxes (benefits) (130) 115 83 259  
NET INCOME (LOSS) (1,089) 187 (761) 409  
Total assets 51,401 52,171 51,401 52,171 $ 52,094
Goodwill 5,618 6,418 5,618 6,418 6,418
Property additions 794 818 1,492 1,486  
Intersegment Eliminations          
Segment Financial Information          
Revenues 0 0 0 0  
Regulated Distribution          
Segment Financial Information          
Revenues 2,200 2,239 4,721 4,801  
Revenues 2,200 2,239 4,721 4,801  
Depreciation 170 170 339 342  
Amortization of regulatory assets, net 61 57 120 86  
Impairment of assets 0 0 0 0  
Investment income (loss) 13 12 24 25  
Interest expense 145 146 292 290  
Income taxes (benefits) 84 91 182 213  
NET INCOME (LOSS) 146 156 311 364  
Total assets 27,907 28,006 27,907 28,006  
Goodwill 5,092 5,092 5,092 5,092 5,092
Property additions 313 312 575 592  
Regulated Distribution | Intersegment Eliminations          
Segment Financial Information          
Revenues 0 0 0 0  
Regulated Transmission          
Segment Financial Information          
Revenues 264 269 539 507  
Revenues 264 269 539 507  
Depreciation 44 38 87 75  
Amortization of regulatory assets, net 2 2 4 5  
Impairment of assets 0 0 0 0  
Investment income (loss) 0 0 0 0  
Interest expense 42 40 85 79  
Income taxes (benefits) 42 52 85 94  
NET INCOME (LOSS) 71 89 145 161  
Total assets 7,855 6,855 7,855 6,855  
Goodwill 526 526 526 526  
Property additions 251 297 509 551  
Regulated Transmission | Intersegment Eliminations          
Segment Financial Information          
Revenues 0 0 0 0  
Competitive Energy Services          
Segment Financial Information          
Revenues 1,008 1,034 2,160 2,209  
Revenues 1,116 1,196 2,420 2,631  
Depreciation 103 99 205 195  
Amortization of regulatory assets, net 0 0 0 0  
Impairment of assets 1,447 16 1,447 16  
Investment income (loss) 18 0 33 12  
Interest expense 48 48 95 96  
Income taxes (benefits) (230) (4) (145) (8)  
NET INCOME (LOSS) (1,259) (8) (1,115) (16)  
Total assets 15,464 16,417 15,464 16,417  
Goodwill 0 800 0 800 $ 800
Property additions 213 191 382 317  
Competitive Energy Services | Intersegment Eliminations          
Segment Financial Information          
Revenues 108 162 260 422  
Other/Corporate          
Segment Financial Information          
Revenues (39) (42) (81) (84)  
Revenues (39) (42) (81) (84)  
Depreciation 17 15 32 29  
Amortization of regulatory assets, net 0 0 0 0  
Impairment of assets 0 0 0 0  
Investment income (loss) 0 (5) 11 (3)  
Interest expense 54 49 105 96  
Income taxes (benefits) (27) (22) (40) (40)  
NET INCOME (LOSS) (47) (50) (102) (100)  
Total assets 175 893 175 893  
Goodwill 0 0 0 0  
Property additions 17 18 26 26  
Other/Corporate | Intersegment Eliminations          
Segment Financial Information          
Revenues 0 0 0 0  
Reconciling Adjustments          
Segment Financial Information          
Revenues (32) (35) (69) (71)  
Revenues (140) (197) (329) (493)  
Depreciation 0 0 0 0  
Amortization of regulatory assets, net 0 0 0 0  
Impairment of assets 0 0 0 0  
Investment income (loss) (12) (10) (21) (20)  
Interest expense 0 (1) 0 0  
Income taxes (benefits) 1 (2) 1 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  
Reconciling Adjustments | Intersegment Eliminations          
Segment Financial Information          
Revenues $ (108) $ (162) $ (260) $ (422)  
[1] Includes excise tax collections of $92 million and $96 million in the three months ended June 30, 2016 and 2015, respectively, and $199 million and $211 million in the six months ended June 30, 2016 and 2015, respectively.