Schedule of Segment Reporting Information, by Segment [Table Text Block] |
Financial data for business segments is as follows:
| | | | | | | | | | | | | | For the Three Months Ended June 30, 2016 | | Revenues from External Customers | | Net Intersegment Revenues | | Operating Income | | (in millions) | Electric Transmission & Distribution | $ | 763 |
| (1) | $ | — |
| | $ | 158 |
| Natural Gas Distribution | 414 |
| | 7 |
| | 20 |
| Energy Services | 393 |
| | 4 |
| | — |
| Midstream Investments (2) | — |
| | — |
| | — |
| Other Operations | 4 |
| | — |
| | 4 |
| Eliminations | — |
| | (11 | ) | | — |
| Consolidated | $ | 1,574 |
| | $ | — |
| | $ | 182 |
|
| | | | | | | | | | | | | | For the Three Months Ended June 30, 2015 | | Revenues from External Customers | | Net Intersegment Revenues | | Operating Income | | (in millions) | Electric Transmission & Distribution | $ | 705 |
| (1) | $ | — |
| | $ | 158 |
| Natural Gas Distribution | 420 |
| | 7 |
| | 19 |
| Energy Services | 404 |
| | 4 |
| | 9 |
| Midstream Investments (2) | — |
| | — |
| | — |
| Other Operations | 3 |
| | — |
| | — |
| Eliminations | — |
| | (11 | ) | | — |
| Consolidated | $ | 1,532 |
| | $ | — |
| | $ | 186 |
|
| | | | | | | | | | | | | | | | | | | For the Six Months Ended June 30, 2016 | | | | | Revenues from External Customers | | Net Intersegment Revenues | | Operating Income | | Total Assets as of June 30, 2016 | | | (in millions) | | Electric Transmission & Distribution | $ | 1,423 |
| (1) | $ | — |
| | $ | 241 |
| | $ | 10,065 |
| | Natural Gas Distribution | 1,302 |
| | 14 |
| | 180 |
| | 5,585 |
| | Energy Services | 825 |
| | 11 |
| | 6 |
| | 973 |
| | Midstream Investments (2) | — |
| | — |
| | — |
| | 2,536 |
| | Other Operations | 8 |
| | — |
| | 5 |
| | 2,771 |
| (3) | Eliminations | — |
| | (25 | ) | | — |
| | (918 | ) | | Consolidated | $ | 3,558 |
| | $ | — |
| | $ | 432 |
| | $ | 21,012 |
| |
| | | | | | | | | | | | | | | | | | | For the Six Months Ended June 30, 2015 | | | | | Revenues from External Customers | | Net Intersegment Revenues | | Operating Income | | Total Assets as of December 31, 2015 | | | (in millions) | | Electric Transmission & Distribution | $ | 1,317 |
| (1) | $ | — |
| | $ | 254 |
| | $ | 10,028 |
| | Natural Gas Distribution | 1,605 |
| | 15 |
| | 165 |
| | 5,657 |
| | Energy Services | 1,036 |
| | 22 |
| | 22 |
| | 857 |
| | Midstream Investments (2) | — |
| | — |
| | — |
| | 2,594 |
| | Other Operations | 7 |
| | — |
| | 1 |
| | 2,879 |
| (3) | Eliminations | — |
| | (37 | ) | | — |
| | (725 | ) | | Consolidated | $ | 3,965 |
| | $ | — |
| | $ | 442 |
| | $ | 21,290 |
| |
| | (1) | Electric Transmission & Distribution revenues from major customers are as follows: |
| | | | | | | | | | | | | | | | | | | | Three Months Ended June 30, | | Six Months Ended June 30, | | | 2016 | | 2015 | | 2016 | | 2015 | | | (in millions) | Affiliates of NRG | | $ | 159 |
| | $ | 172 |
| | $ | 304 |
| | $ | 356 |
| Affiliates of Energy Future Holdings Corp. | | $ | 50 |
| | $ | 51 |
| | $ | 95 |
| | $ | 103 |
|
| | (2) | Midstream Investments’ equity earnings are as follows: |
| | | | | | | | | | | | | | | | | | | | Three Months Ended June 30, | | Six Months Ended June 30, | | | 2016 | | 2015 | | 2016 | | 2015 | | | (in millions) | Enable | | $ | 31 |
| | $ | 43 |
| | $ | 91 |
| | $ | 95 |
|
Midstream Investments’ total assets are as follows: | | | | | | | | | | | | June 30, 2016 | | December 31, 2015 | | | (in millions) | Enable | | $ | 2,536 |
| | $ | 2,594 |
|
| | (3) | Included in total assets of Other Operations as of June 30, 2016 and December 31, 2015 are pension and other postemployment-related regulatory assets of $791 million and $814 million, respectively. |
|
Midstream Investments [Table Text Block] |
Midstream Investments’ equity earnings are as follows: | | | | | | | | | | | | | | | | | | | | Three Months Ended June 30, | | Six Months Ended June 30, | | | 2016 | | 2015 | | 2016 | | 2015 | | | (in millions) | Enable | | $ | 31 |
| | $ | 43 |
| | $ | 91 |
| | $ | 95 |
|
Midstream Investments’ total assets are as follows: | | | | | | | | | | | | June 30, 2016 | | December 31, 2015 | | | (in millions) | Enable | | $ | 2,536 |
| | $ | 2,594 |
|
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