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Segment Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Segment Financial Information |  |  |  |  |  |
Revenues |  | $ 3,917 | $ 4,123 | $ 11,187 | $ 11,485 |
Revenues | [1] | 3,917 | 4,123 | 11,187 | 11,485 |
Depreciation |  | 311 | 328 | 974 | 969 |
Amortization of regulatory assets, net |  | 98 | 110 | 222 | 201 |
Impairment of assets |  | 0 | 8 | 1,447 | 24 |
Investment income (loss) |  | 28 | (28) | 75 | (14) |
Interest expense |  | 286 | 285 | 863 | 846 |
Income taxes (benefits) |  | 251 | 226 | 334 | 485 |
NET INCOME (LOSS) |  | 380 | 395 | (381) | 804 |
Total assets |  | 51,961 | 51,930 | 51,961 | 51,930 | $ 52,094
Goodwill |  | 5,618 | 6,418 | 5,618 | 6,418 | 6,418
Property additions |  | 664 | 539 | 2,156 | 2,025 |
Regulated Distribution |  |  |  |  |  |
Segment Financial Information |  |  |  |  |  |
Goodwill |  | 5,092 |  | 5,092 |  | 5,092
Competitive Energy Services |  |  |  |  |  |
Segment Financial Information |  |  |  |  |  |
Goodwill |  | 0 |  | 0 |  | $ 800
Operating Segments | Regulated Distribution |  |  |  |  |  |
Segment Financial Information |  |  |  |  |  |
Revenues |  | 2,702 | 2,624 | 7,423 | 7,425 |
Revenues |  | 2,702 | 2,624 | 7,423 | 7,425 |
Depreciation |  | 171 | 174 | 510 | 516 |
Amortization of regulatory assets, net |  | 98 | 110 | 218 | 196 |
Impairment of assets |  |  | 8 | 0 | 8 |
Investment income (loss) |  | 13 | 8 | 37 | 33 |
Interest expense |  | 139 | 149 | 431 | 439 |
Income taxes (benefits) |  | 167 | 137 | 349 | 350 |
NET INCOME (LOSS) |  | 283 | 234 | 594 | 598 |
Total assets |  | 28,276 | 27,883 | 28,276 | 27,883 |
Goodwill |  | 5,092 | 5,092 | 5,092 | 5,092 |
Property additions |  | 303 | 292 | 878 | 884 |
Operating Segments | Regulated Transmission |  |  |  |  |  |
Segment Financial Information |  |  |  |  |  |
Revenues |  | 285 | 248 | 824 | 755 |
Revenues |  | 285 | 248 | 824 | 755 |
Depreciation |  | 45 | 41 | 132 | 116 |
Amortization of regulatory assets, net |  | 0 | 0 | 4 | 5 |
Impairment of assets |  |  | 0 | 0 | 0 |
Investment income (loss) |  | 0 | 0 | 0 | 0 |
Interest expense |  | 43 | 40 | 128 | 119 |
Income taxes (benefits) |  | 45 | 41 | 130 | 135 |
NET INCOME (LOSS) |  | 78 | 70 | 223 | 231 |
Total assets |  | 8,034 | 6,988 | 8,034 | 6,988 |
Goodwill |  | 526 | 526 | 526 | 526 |
Property additions |  | 246 | 149 | 755 | 700 |
Operating Segments | Competitive Energy Services |  |  |  |  |  |
Segment Financial Information |  |  |  |  |  |
Revenues |  | 998 | 1,327 | 3,158 | 3,536 |
Revenues |  | 1,115 | 1,468 | 3,535 | 4,099 |
Depreciation |  | 79 | 98 | 284 | 293 |
Amortization of regulatory assets, net |  | 0 | 0 | 0 | 0 |
Impairment of assets |  |  | 0 | 1,447 | 16 |
Investment income (loss) |  | 23 | (19) | 56 | (7) |
Interest expense |  | 48 | 48 | 143 | 144 |
Income taxes (benefits) |  | 49 | 84 | (96) | 76 |
NET INCOME (LOSS) |  | 86 | 145 | (1,029) | 129 |
Total assets |  | 15,165 | 16,229 | 15,165 | 16,229 |
Goodwill |  | 0 | 800 | 0 | 800 |
Property additions |  | 110 | 83 | 492 | 400 |
Corporate/Other |  |  |  |  |  |
Segment Financial Information |  |  |  |  |  |
Revenues |  | 0 | 0 | 0 | 0 |
Revenues |  | 0 | 0 | 0 | 0 |
Depreciation |  | 16 | 15 | 48 | 44 |
Amortization of regulatory assets, net |  | 0 | 0 | 0 | 0 |
Impairment of assets |  |  | 0 | 0 | 0 |
Investment income (loss) |  | 2 | (6) | 13 | (9) |
Interest expense |  | 56 | 48 | 161 | 144 |
Income taxes (benefits) |  | (11) | (39) | (51) | (84) |
NET INCOME (LOSS) |  | (67) | (54) | (169) | (154) |
Total assets |  | 486 | 830 | 486 | 830 |
Goodwill |  | 0 | 0 | 0 | 0 |
Property additions |  | 5 | 15 | 31 | 41 |
Intersegment Eliminations |  |  |  |  |  |
Segment Financial Information |  |  |  |  |  |
Revenues |  | (117) | (141) | (377) | (563) |
Intersegment Eliminations | Competitive Energy Services |  |  |  |  |  |
Segment Financial Information |  |  |  |  |  |
Revenues |  | 117 | 141 | 377 | 563 |
Reconciling Adjustments |  |  |  |  |  |
Segment Financial Information |  |  |  |  |  |
Revenues |  | (68) | (76) | (218) | (231) |
Revenues |  | (185) | (217) | (595) | (794) |
Depreciation |  | 0 | 0 | 0 | 0 |
Amortization of regulatory assets, net |  | 0 | 0 | 0 | 0 |
Impairment of assets |  |  | 0 | 0 | 0 |
Investment income (loss) |  | (10) | (11) | (31) | (31) |
Interest expense |  | 0 | 0 | 0 | 0 |
Income taxes (benefits) |  | 1 | 3 | 2 | 8 |
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 $111 million and $109 million in the three months ended September 30, 2016 and 2015, respectively, and $310 million and $320 million in the nine months ended September 30, 2016 and 2015, respectively.

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