Consolidated Statements of Operations (Unaudited) - USD ($) shares in Millions, $ in Millions |
3 Months Ended | |
|---|---|---|
Mar. 31, 2019 |
Mar. 31, 2018 |
|
| Income Statement [Abstract] | ||
| Operating revenues | $ 813 | $ 761 |
| Operating expenses: | ||
| Operation and maintenance | 365 | 347 |
| Depreciation and amortization | 144 | 129 |
| General taxes | 69 | 70 |
| (Gain) on asset dispositions and purchases | (3) | (2) |
| Total operating expenses, net | 575 | 544 |
| Operating income | 238 | 217 |
| Other income (expense): | ||
| Interest, net | (93) | (84) |
| Non-operating benefit costs, net | 4 | 3 |
| Other, net | 3 | 4 |
| Total other income (expense) | (86) | (77) |
| Income before income taxes | 152 | 140 |
| Provision for income taxes | 39 | 34 |
| Net income attributable to common shareholders | $ 113 | $ 106 |
| Basic earnings per share: | ||
| Net income attributable to common shareholders (dollars per share) | $ 0.62 | $ 0.60 |
| Diluted earnings per share: | ||
| Net income attributable to common shareholders (dollars per share) | $ 0.62 | $ 0.59 |
| Weighted-average common shares outstanding: | ||
| Basic (shares) | 181 | 178 |
| Diluted (shares) | 181 | 179 |