Consolidated Statements of Operations (Unaudited) - USD ($)
shares in Millions, $ in Millions |
3 Months Ended |
6 Months Ended |
Jun. 30, 2018 |
Jun. 30, 2017 |
Jun. 30, 2018 |
Jun. 30, 2017 |
| Income Statement [Abstract] |
|
|
|
|
|
| Operating revenues |
|
$ 853
|
$ 844
|
$ 1,614
|
$ 1,600
|
| Operating expenses: |
|
|
|
|
|
| Operation and maintenance |
|
348
|
347
|
695
|
681
|
| Depreciation and amortization |
|
134
|
126
|
263
|
250
|
| General taxes |
|
69
|
63
|
139
|
131
|
| Gain on asset dispositions and purchases |
|
0
|
(2)
|
(2)
|
(2)
|
| Total operating expenses, net |
|
551
|
534
|
1,095
|
1,060
|
| Operating income |
|
302
|
310
|
519
|
540
|
| Other income (expense): |
|
|
|
|
|
| Interest, net |
|
(86)
|
(85)
|
(170)
|
(170)
|
| Non-operating benefit costs, net |
|
2
|
(2)
|
5
|
(5)
|
| Other, net |
|
4
|
3
|
8
|
6
|
| Total other income (expense) |
|
(80)
|
(84)
|
(157)
|
(169)
|
| Income before income taxes |
|
222
|
226
|
362
|
371
|
| Provision for income taxes |
|
60
|
95
|
94
|
147
|
| Net income attributable to common stockholders |
|
$ 162
|
$ 131
|
$ 268
|
$ 224
|
| Basic earnings per share: |
|
|
|
|
|
| Net income attributable to common stockholders - Basic (dollars per share) |
[1] |
$ 0.90
|
$ 0.74
|
$ 1.50
|
$ 1.26
|
| Diluted earnings per share: |
|
|
|
|
|
| Net income attributable to common stockholders - Diluted (dollars per share) |
[1] |
$ 0.91
|
$ 0.73
|
$ 1.50
|
$ 1.26
|
| Weighted-average common shares outstanding: |
|
|
|
|
|
| Weighted-average common shares outstanding - Basic (per share) |
|
179
|
178
|
179
|
178
|
| Weighted-average common shares outstanding - Diluted (per share) |
|
179
|
179
|
179
|
179
|
| Dividends declared per common share (dollars per share) |
|
$ 0.455
|
$ 0.415
|
$ 0.455
|
$ 0.415
|
|
|