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Segment Information (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Segment Financial Information |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 14,562 |  | $ 15,026 |  | $ 15,049 |
Total revenues | $ 3,375 | $ 3,917 | $ 3,401 | $ 3,869 | $ 3,541 | $ 4,123 | $ 3,465 | $ 3,897 | 14,562 | [1] | 15,026 | [1] | 15,049 | [1]
Depreciation | 339 | 311 | 334 | 329 | 313 | 328 | 322 | 319 | 1,313 |  | 1,282 |  | 1,220 |
Amortization of regulatory assets, net |  |  |  |  |  |  |  |  | 320 |  | 268 |  | 12 |
Impairment of assets | 9,218 | 0 | 1,447 | 0 | 18 | 8 | 16 | 0 | 10,665 |  | 42 |  | 0 |
Investment income (loss) |  |  |  |  |  |  |  |  | 84 |  | (22) |  | 72 |
Impairment of equity method investment |  |  |  |  |  |  |  |  | 0 |  | 362 |  | 0 |
Interest expense |  |  |  |  |  |  |  |  | 1,157 |  | 1,132 |  | 1,081 |
Income taxes (benefits) | (3,389) | 251 | (130) | 213 | (170) | 226 | 115 | 144 | (3,055) |  | 315 |  | (42) |
Income (loss) from continuing operations |  |  |  |  |  |  |  |  | (6,177) |  | 578 |  | 213 |
Discontinued operations, net of tax |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 86 |
NET INCOME (LOSS) | (5,796) | $ 380 | $ (1,089) | $ 328 | (226) | $ 395 | $ 187 | $ 222 | (6,177) |  | 578 |  | 299 |
Total assets | 43,148 |  |  |  | 52,094 |  |  |  | 43,148 |  | 52,094 |  | 51,552 |
Total goodwill | 5,618 |  |  |  | 6,418 |  |  |  | 5,618 |  | 6,418 |  | 6,418 |
Property additions |  |  |  |  |  |  |  |  | 2,835 |  | 2,704 |  | 3,312 |
Intersegment Eliminations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Financial Information |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Regulated Distribution |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Financial Information |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 9,629 |  | 9,582 |  | 9,054 |
Total revenues |  |  |  |  |  |  |  |  | 9,629 |  | 9,582 |  | 9,054 |
Depreciation |  |  |  |  |  |  |  |  | 676 |  | 664 |  | 651 |
Amortization of regulatory assets, net |  |  |  |  |  |  |  |  | 313 |  | 261 |  | 1 |
Impairment of assets |  |  |  |  |  |  |  |  | 0 |  | 8 |  |  |
Investment income (loss) |  |  |  |  |  |  |  |  | 49 |  | 42 |  | 56 |
Impairment of equity method investment |  |  |  |  |  |  |  |  |  |  | 0 |  |  |
Interest expense |  |  |  |  |  |  |  |  | 586 |  | 600 |  | 603 |
Income taxes (benefits) |  |  |  |  |  |  |  |  | 375 |  | 325 |  | 209 |
Income (loss) from continuing operations |  |  |  |  |  |  |  |  |  |  |  |  | 433 |
Discontinued operations, net of tax |  |  |  |  |  |  |  |  |  |  |  |  | 0 |
NET INCOME (LOSS) |  |  |  |  |  |  |  |  | 651 |  | 588 |  | 433 |
Total assets | 27,702 |  |  |  | 27,390 |  |  |  | 27,702 |  | 27,390 |  | 27,332 |
Total goodwill | 5,004 |  |  |  | 5,092 |  |  |  | 5,004 |  | 5,092 |  | 5,092 |
Property additions |  |  |  |  |  |  |  |  | 1,063 |  | 1,040 |  | 855 |
Regulated Distribution | Intersegment Eliminations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Financial Information |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Regulated Transmission |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Financial Information |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 1,151 |  | 1,054 |  | 817 |
Total revenues |  |  |  |  |  |  |  |  | 1,151 |  | 1,054 |  | 817 |
Depreciation |  |  |  |  |  |  |  |  | 187 |  | 164 |  | 134 |
Amortization of regulatory assets, net |  |  |  |  |  |  |  |  | 7 |  | 7 |  | 11 |
Impairment of assets |  |  |  |  |  |  |  |  | 0 |  | 0 |  |  |
Investment income (loss) |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Impairment of equity method investment |  |  |  |  |  |  |  |  |  |  | 0 |  |  |
Interest expense |  |  |  |  |  |  |  |  | 158 |  | 147 |  | 117 |
Income taxes (benefits) |  |  |  |  |  |  |  |  | 187 |  | 191 |  | 139 |
Income (loss) from continuing operations |  |  |  |  |  |  |  |  |  |  |  |  | 255 |
Discontinued operations, net of tax |  |  |  |  |  |  |  |  |  |  |  |  | 0 |
NET INCOME (LOSS) |  |  |  |  |  |  |  |  | 331 |  | 328 |  | 255 |
Total assets | 8,755 |  |  |  | 7,800 |  |  |  | 8,755 |  | 7,800 |  | 6,864 |
Total goodwill | 614 |  |  |  | 526 |  |  |  | 614 |  | 526 |  | 526 |
Property additions |  |  |  |  |  |  |  |  | 1,101 |  | 1,020 |  | 1,446 |
Regulated Transmission | Intersegment Eliminations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Financial Information |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Competitive Energy Services |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Financial Information |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 4,070 |  | 4,698 |  | 5,470 |
Total revenues |  |  |  |  |  |  |  |  | 4,549 |  | 5,384 |  | 6,289 |
Depreciation |  |  |  |  |  |  |  |  | 387 |  | 394 |  | 387 |
Amortization of regulatory assets, net |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Impairment of assets |  |  |  |  |  |  |  |  | 10,665 |  | 34 |  |  |
Investment income (loss) |  |  |  |  |  |  |  |  | 66 |  | (16) |  | 54 |
Impairment of equity method investment |  |  |  |  |  |  |  |  |  |  | 0 |  |  |
Interest expense |  |  |  |  |  |  |  |  | 194 |  | 192 |  | 197 |
Income taxes (benefits) |  |  |  |  |  |  |  |  | (3,498) |  | 50 |  | (223) |
Income (loss) from continuing operations |  |  |  |  |  |  |  |  |  |  |  |  | (417) |
Discontinued operations, net of tax |  |  |  |  |  |  |  |  |  |  |  |  | 86 |
NET INCOME (LOSS) |  |  |  |  |  |  |  |  | (6,919) |  | 89 |  | (331) |
Total assets | 5,952 |  |  |  | 16,027 |  |  |  | 5,952 |  | 16,027 |  | 16,180 |
Total goodwill | 0 |  |  |  | 800 |  |  |  | 0 |  | 800 |  | 800 |
Property additions |  |  |  |  |  |  |  |  | 619 |  | 588 |  | 939 |
Competitive Energy Services | Intersegment Eliminations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Financial Information |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 479 |  | 686 |  | 819 |
Other/Corporate |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Financial Information |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Total revenues |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Depreciation |  |  |  |  |  |  |  |  | 63 |  | 60 |  | 48 |
Amortization of regulatory assets, net |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Impairment of assets |  |  |  |  |  |  |  |  | 0 |  | 0 |  |  |
Investment income (loss) |  |  |  |  |  |  |  |  | 10 |  | (9) |  | 2 |
Impairment of equity method investment |  |  |  |  |  |  |  |  |  |  | 362 |  |  |
Interest expense |  |  |  |  |  |  |  |  | 219 |  | 193 |  | 168 |
Income taxes (benefits) |  |  |  |  |  |  |  |  | (121) |  | (262) |  | (178) |
Income (loss) from continuing operations |  |  |  |  |  |  |  |  |  |  |  |  | (58) |
Discontinued operations, net of tax |  |  |  |  |  |  |  |  |  |  |  |  | 0 |
NET INCOME (LOSS) |  |  |  |  |  |  |  |  | (240) |  | (427) |  | (58) |
Total assets | 739 |  |  |  | 877 |  |  |  | 739 |  | 877 |  | 1,176 |
Total goodwill | 0 |  |  |  | 0 |  |  |  | 0 |  | 0 |  | 0 |
Property additions |  |  |  |  |  |  |  |  | 52 |  | 56 |  | 72 |
Other/Corporate | Intersegment Eliminations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Financial Information |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Reconciling Adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Financial Information |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | (288) |  | (308) |  | (292) |
Total revenues |  |  |  |  |  |  |  |  | (767) |  | (994) |  | (1,111) |
Depreciation |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Amortization of regulatory assets, net |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Impairment of assets |  |  |  |  |  |  |  |  | 0 |  | 0 |  |  |
Investment income (loss) |  |  |  |  |  |  |  |  | (41) |  | (39) |  | (40) |
Impairment of equity method investment |  |  |  |  |  |  |  |  |  |  | 0 |  |  |
Interest expense |  |  |  |  |  |  |  |  | 0 |  | 0 |  | (4) |
Income taxes (benefits) |  |  |  |  |  |  |  |  | 2 |  | 11 |  | 11 |
Income (loss) from continuing operations |  |  |  |  |  |  |  |  |  |  |  |  | 0 |
Discontinued operations, net of tax |  |  |  |  |  |  |  |  |  |  |  |  | 0 |
NET INCOME (LOSS) |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Total assets | 0 |  |  |  | 0 |  |  |  | 0 |  | 0 |  | 0 |
Total goodwill | $ 0 |  |  |  | $ 0 |  |  |  | 0 |  | 0 |  | 0 |
Property additions |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Reconciling Adjustments | Intersegment Eliminations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Financial Information |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ (479) |  | $ (686) |  | $ (819) |
[1] | Includes excise tax collections of $406 million, $416 million and $420 million in 2016, 2015 and 2014, respectively.

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