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Stock Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Accrual Adjustments |
|  |  | 2017 |  | 2016 |  | 2015 |
|  |  | Millions |
| Compensation Cost included in Operation and Maintenance Expense |  | $ | 31 |  |  | $ | 29 |  |  | $ | 34 |  |
| Income Tax Benefit Recognized in Consolidated Statement of Operations |  | $ | 13 |  |  | $ | 12 |  |  | $ | 14 |  |
Stock Options Activity | Changes in stock options for 2017 are summarized as follows:
|  |  | Options |  | Weighted Average Exercise Price |  | Weighted Average Remaining Years Contractual Term |  | Aggregate Intrinsic Value |
| Outstanding as of January 1, 2017 |  | 1,029,900 |  |  | $ | 37.93 |  |  |  |  |  |
| Exercised |  | 654,200 |  |  | $ | 40.02 |  |  |  |  |  |
| Canceled/Forfeited |  | 27,800 |  |  | $ | 44.44 |  |  |  |  |  |
| Outstanding as of December 31, 2017 |  | 347,900 |  |  | $ | 33.49 |  |  | 1.9 |  | $ | 6,265,679 |  |
| Exercisable at December 31, 2017 |  | 347,900 |  |  | $ | 33.49 |  |  | 1.9 |  | $ | 6,265,679 |  |
Activity For Options Exercised | Activity for options exercised for the years ended December 31, 2017, 2016 and 2015 is shown below:
|  |  | 2017 |  | 2016 |  | 2015 |
|  |  | Millions |
| Total Intrinsic Value of Options Exercised |  | $ | 5 |  |  | $ | 7 |  |  | $ | 3 |  |
| Cash Received from Options Exercised |  | $ | 26 |  |  | $ | 22 |  |  | $ | 12 |  |
| Tax Benefit Realized from Options Exercised |  | $ | — |  |  | $ | 1 |  |  | $ | — |  |
Restricted Stock Units Activity | Changes in restricted stock units for the year ended December 31, 2017 are summarized as follows:
|  |  | Shares |  | Weighted Average Grant Date Fair Value |  | Weighted Average Remaining Years Contractual Term |  | Aggregate Intrinsic Value |
| Non-vested as of January 1, 2017 |  | 322,196 |  |  | $ | 38.75 |  |  |  |  |  |
| Granted |  | 212,158 |  |  | $ | 44.33 |  |  |  |  |  |
| Vested |  | 303,092 |  |  | $ | 39.96 |  |  |  |  |  |
| Canceled/Forfeited |  | 17,363 |  |  | $ | 41.76 |  |  |  |  |  |
| Non-vested as of December 31, 2017 |  | 213,899 |  |  | $ | 42.32 |  |  | 1.0 |  | $ | 11,015,850 |  |
Performance Units Information | Changes in performance share units for the year ended December 31, 2017 are summarized as follows:
|  |  | Shares |  | Weighted Average Grant Date Fair Value |  | Weighted Average Remaining Years Contractual Term |  | Aggregate Intrinsic Value |
| Non-vested as of January 1, 2017 |  | 393,812 |  |  | $ | 44.20 |  |  |  |  |  |
| Granted |  | 382,830 |  |  | $ | 45.02 |  |  |  |  |  |
| Vested |  | 402,451 |  |  | $ | 44.03 |  |  |  |  |  |
| Canceled/Forfeited |  | 41,730 |  |  | $ | 44.69 |  |  |  |  |  |
| Non-vested as of December 31, 2017 |  | 332,461 |  |  | $ | 45.29 |  |  | 1.7 |  | $ | 17,121,742 |  |

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- Definition Tabular disclosure of number, weighted-average exercise price or conversion ratio, aggregate intrinsic value, and weighted-average remaining contractual term for outstanding performance-based awards that are fully vested and expected to vest. Includes, but is not limited to, unvested awards for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of number, weighted-average exercise price or conversion ratio, aggregate intrinsic value, and weighted-average remaining contractual term for outstanding restricted stock units that are fully vested and expected to vest. Includes, but is not limited to, unvested restricted stock units for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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