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Segment Information (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Segment Financial Information      
Revenues $ 3,552 $ 3,869  
Revenues [1] 3,552 3,869  
Depreciation 275 329  
Amortization of regulatory assets, net 59 61  
Investment income 24 28  
Interest expense 287 288  
Income taxes (benefits) 126 213  
NET INCOME 205 328  
Total assets 43,212 52,695 $ 43,148
Goodwill 5,618 6,418 $ 5,618
Property additions 588 698  
Operating Segments | Regulated Distribution      
Segment Financial Information      
Revenues 2,490 2,510  
Revenues 2,490 2,510  
Depreciation 178 167  
Amortization of regulatory assets, net 57 59  
Investment income 14 11  
Interest expense 138 150  
Income taxes (benefits) 138 94  
NET INCOME 237 158  
Total assets 27,826 27,447  
Goodwill 5,004 5,004  
Property additions 264 241  
Operating Segments | Regulated Transmission      
Segment Financial Information      
Revenues 313 286  
Revenues 313 286  
Depreciation 51 45  
Amortization of regulatory assets, net 2 2  
Investment income 0 0  
Interest expense 39 40  
Income taxes (benefits) 52 47  
NET INCOME 88 81  
Total assets 8,938 8,139  
Goodwill 614 614  
Property additions 224 279  
Operating Segments | Competitive Energy Services      
Segment Financial Information      
Revenues 814 1,152  
Revenues 931 1,304  
Depreciation 28 102  
Amortization of regulatory assets, net 0 0  
Investment income 20 15  
Interest expense 45 47  
Income taxes (benefits) (35) 85  
NET INCOME (67) 144  
Total assets 5,811 16,578  
Goodwill 0 800  
Property additions 92 169  
Corporate/Other      
Segment Financial Information      
Revenues 0 0  
Revenues 0 0  
Depreciation 18 15  
Amortization of regulatory assets, net 0 0  
Investment income 3 11  
Interest expense 65 51  
Income taxes (benefits) (29) (13)  
NET INCOME (53) (55)  
Total assets 637 531  
Goodwill 0 0  
Property additions 8 9  
Intersegment Eliminations      
Segment Financial Information      
Revenues (117) (152)  
Intersegment Eliminations | Competitive Energy Services      
Segment Financial Information      
Revenues 117 152  
Reconciling Adjustments      
Segment Financial Information      
Revenues (65) (79)  
Revenues (182) (231)  
Depreciation 0 0  
Amortization of regulatory assets, net 0 0  
Investment income (13) (9)  
Interest expense 0 0  
Income taxes (benefits) 0 0  
NET INCOME 0 0  
Total assets 0 0  
Goodwill 0 0  
Property additions $ 0 $ 0  
[1] Includes excise tax collections of $100 million and $107 million in the three months ended March 31, 2017 and 2016, respectively.