The following tables include the Company’s summarized segment information: | | | | | | | | | | | | | | | | | | As of or for the Three Months Ended March 31, 2018 | | Regulated
Businesses | | Market-Based
Businesses | | Other | | Consolidated | Operating revenues | $ | 666 |
| | $ | 100 |
| | $ | (5 | ) | | $ | 761 |
| Depreciation and amortization | 122 |
| | 4 |
| | 3 |
| | 129 |
| Total operating expenses, net | 462 |
| | 86 |
| | (4 | ) | | 544 |
| Interest, net | (69 | ) | | 1 |
| | (16 | ) | | (84 | ) | Income before income taxes | 142 |
| | 16 |
| | (18 | ) | | 140 |
| Provision for income taxes | 38 |
| | 4 |
| | (8 | ) | | 34 |
| Net income attributable to common stockholders | 104 |
| | 12 |
| | (10 | ) | | 106 |
| Total assets | 17,817 |
| | 604 |
| | 1,307 |
| | 19,728 |
|
| | | | | | | | | | | | | | | | | | As of or for the Three Months Ended March 31, 2017 | | Regulated
Businesses | | Market-Based
Businesses | | Other | | Consolidated | Operating revenues | $ | 659 |
| | $ | 103 |
| | $ | (6 | ) | | $ | 756 |
| Depreciation and amortization | 117 |
| | 4 |
| | 3 |
| | 124 |
| Total operating expenses, net | 438 |
| | 94 |
| | (6 | ) | | 526 |
| Interest, net | (66 | ) | | — |
| | (19 | ) | | (85 | ) | Income before income taxes | 154 |
| | 10 |
| | (19 | ) | | 145 |
| Provision for income taxes | 60 |
| | 3 |
| | (11 | ) | | 52 |
| Net income attributable to common stockholders | 94 |
| | 7 |
| | (8 | ) | | 93 |
| Total assets | 16,632 |
| | 555 |
| | 1,423 |
| | 18,610 |
|
|