Schedule of Segment Reporting Information, by Segment [Table Text Block] |
Financial data for business segments is as follows (in millions): | | | | | | | | | | | | | | | For the Three Months Ended June 30, 2014 | | | Revenues from External Customers | | Net Intersegment Revenues | | Operating Income | | Electric Transmission & Distribution | $ | 698 |
| (1) | $ | — |
| | $ | 145 |
| | Natural Gas Distribution | 526 |
| | 6 |
| | 30 |
| | Energy Services | 657 |
| | 19 |
| | 11 |
| | Midstream Investments (3) | — |
| | — |
| | — |
| | Other Operations | 3 |
| | — |
| | — |
| | Eliminations | — |
| | (25 | ) | | — |
| | Consolidated | $ | 1,884 |
|
| $ | — |
| | $ | 186 |
| | | | | | | | | | For the Three Months Ended June 30, 2013 | | | Revenues from External Customers | | Net Intersegment Revenues | | Operating Income (Loss) | | Electric Transmission & Distribution | $ | 656 |
| (1) | $ | — |
| | $ | 165 |
| | Natural Gas Distribution | 524 |
| | 5 |
| | 25 |
| | Energy Services | 622 |
| | 6 |
| | 3 |
| | Interstate Pipelines | 41 |
| (2) | 13 |
| (2) | 20 |
| (2) | Field Services | 48 |
| (2) | 7 |
| (2) | 20 |
| (2) | Midstream Investments (3) | — |
| | — |
| | — |
| | Other Operations | 3 |
| | — |
| | (10 | ) | | Eliminations | — |
| | (31 | ) | | — |
| | Consolidated | $ | 1,894 |
| | $ | — |
| | $ | 223 |
| |
| | | | | | | | | | | | | | | | | | | For the Six Months Ended June 30, 2014 | | | | | Revenues from External Customers | | Net Intersegment Revenues | | Operating Income | | Total Assets as of June 31, 2014 | | Electric Transmission & Distribution | $ | 1,327 |
| (1) | $ | — |
| | $ | 250 |
| | $ | 9,809 |
| | Natural Gas Distribution | 2,004 |
| | 15 |
| | 192 |
| | 4,989 |
| | Energy Services | 1,709 |
| | 51 |
| | 37 |
| | 896 |
| | Midstream Investments (3) | — |
| | — |
| | — |
| | 4,517 |
| | Other Operations | 7 |
| | — |
| | 2 |
| | 2,902 |
| (4) | Eliminations | — |
| | (66 | ) | | — |
| | (1,193 | ) | | Consolidated | $ | 5,047 |
| | $ | — |
| | $ | 481 |
| | $ | 21,920 |
| |
| | | | | | | | | | | | | | | | | | | For the Six Months Ended June 30, 2013 | | | | | Revenues from External Customers | | Net Intersegment Revenues | | Operating Income (Loss) | | Total Assets as of December 31, 2013 | | Electric Transmission & Distribution | $ | 1,188 |
| (1) | $ | — |
| | $ | 249 |
| | $ | 9,605 |
| | Natural Gas Distribution | 1,567 |
| | 13 |
| | 164 |
| | 4,976 |
| | Energy Services | 1,210 |
| | 15 |
| | 10 |
| | 895 |
| | Interstate Pipelines | 133 |
| (2) | 53 |
| (2) | 72 |
| (2) | — |
| | Field Services | 178 |
| (2) | 18 |
| (2) | 73 |
| (2) | — |
| | Midstream Investments (3) | — |
| | — |
| | — |
| | 4,518 |
| | Other Operations | 6 |
| | — |
| | (13 | ) | | 3,026 |
| (4) | Eliminations | — |
| | (99 | ) | | — |
| | (1,150 | ) | | Consolidated | $ | 4,282 |
| | $ | — |
| | $ | 555 |
| | $ | 21,870 |
| | | | | | | | | | |
________________ | | (1) | Sales to affiliates of NRG in the three months ended June 30, 2014 and 2013 represented approximately $164 million and $148 million, respectively, of CenterPoint Houston’s transmission and distribution revenues. Sales to affiliates of Energy Future Holdings Corp. in the three months ended June 30, 2014 and 2013 represented approximately $41 million and $37 million, respectively, of CenterPoint Houston’s transmission and distribution revenues. Sales to affiliates of NRG in the six months ended June 30, 2014 and 2013 represented approximately $330 million and $291 million, respectively, of CenterPoint Houston’s transmission and distribution revenues. Sales to affiliates of Energy Future Holdings Corp. in the six months ended June 30, 2014 and 2013 represented approximately $81 million and $73 million, respectively, of CenterPoint Houston’s transmission and distribution revenues. |
| | (2) | Results reflected in the three months ended June 30, 2013 represent only the month of April 2013. Results reflected in the six months ended June 30, 2013 represent only January 2013 through April 2013. |
| | (3) | Midstream Investments reported equity earnings of $69 million from Enable and $2 million of equity earnings from CenterPoint Energy’s interest in SESH for the three months ended June 30, 2014. Midstream Investments reported equity earnings of $157 million from Enable and $5 million of equity earnings from CenterPoint Energy’s interest in SESH for the six months ended June 30, 2014. Midstream Investments reported equity earnings of $33 million from Enable and $2 million of equity earnings from CenterPoint Energy’s interest in SESH for the months of May and June 2013. Included in total assets of Midstream Investments as of June 30, 2014 and December 31, 2013 is $4,517 million and $4,319 million, respectively, related to CenterPoint Energy’s investment in Enable and $-0- and $199 million, respectively, related to CenterPoint Energy’s interest in SESH. |
| | (4) | Included in total assets of Other Operations as of June 30, 2014 and December 31, 2013 are pension and other postemployment related regulatory assets of $605 million and $627 million, respectively. |
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