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Stock Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Accrual Adjustments |
|  |  | 2015 |  | 2014 |  | 2013 |
|  |  | Millions |
| Compensation Cost included in Operation and Maintenance Expense |  | $ | 34 |  |  | $ | 32 |  |  | $ | 32 |  |
| Income Tax Benefit Recognized in Consolidated Statement of Operations |  | $ | 14 |  |  | $ | 13 |  |  | $ | 13 |  |
Stock Options Activity | Changes in stock options for 2015 are summarized as follows:
|  |  | Options |  | Weighted Average Exercise Price |  | Weighted Average Remaining Years Contractual Term |  | Aggregate Intrinsic Value |
| Outstanding as of January 1, 2015 |  | 2,075,850 |  |  | $ | 35.35 |  |  |  |  |  |
| Exercised |  | 368,600 |  |  | $ | 32.37 |  |  |  |  |  |
| Canceled/Forfeited |  | — |  |  | $ | — |  |  |  |  |  |
| Outstanding as of December 31, 2015 |  | 1,707,250 |  |  | $ | 36.00 |  |  | 2.8 |  | $ | 8,120,788 |  |
| Exercisable at December 31, 2015 |  | 1,707,250 |  |  | $ | 36.00 |  |  | 2.8 |  | $ | 8,120,788 |  |
Activity For Options Exercised | Activity for options exercised for the years ended December 31, 2015, 2014 and 2013 is shown below:
|  |  | 2015 |  | 2014 |  | 2013 |
|  |  | Millions |
| Total Intrinsic Value of Options Exercised |  | $ | 3 |  |  | $ | 4 |  |  | $ | 1 |  |
| Cash Received from Options Exercised |  | $ | 12 |  |  | $ | 16 |  |  | $ | 7 |  |
| Tax Benefit Realized from Options Exercised |  | $ | — |  |  | $ | — |  |  | $ | — |  |
Restricted Stock Units Activity | Changes in restricted stock units for the year ended December 31, 2015 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, 2015 |  | 1,069,029 |  |  | $ | 32.49 |  |  |  |  |  |
| Granted |  | 318,805 |  |  | $ | 39.65 |  |  |  |  |  |
| Vested |  | 963,387 |  |  | $ | 33.73 |  |  |  |  |  |
| Canceled/Forfeited |  | 15,940 |  |  | $ | 37.28 |  |  |  |  |  |
| Non-vested as of December 31, 2015 |  | 408,507 |  |  | $ | 34.95 |  |  | 1.1 |  | $ | 15,805,175 |  |
Performance Units Information | Changes in performance share units for the year ended December 31, 2015 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, 2015 |  | 765,633 |  |  | $ | 36.86 |  |  |  |  |  |
| Granted |  | 337,585 |  |  | $ | 41.32 |  |  |  |  |  |
| Vested |  | 655,201 |  |  | $ | 36.82 |  |  |  |  |  |
| Canceled/Forfeited |  | 44,056 |  |  | $ | 38.97 |  |  |  |  |  |
| Non-vested as of December 31, 2015 |  | 403,961 |  |  | $ | 40.42 |  |  | 1.6 |  | $ | 15,629,251 |  |

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- Definition Tabular disclosure of the number, aggregate intrinsic value (except for nonpublic entities), and weighted-average remaining contractual term for both performance-based awards (or share units) outstanding and performance-based awards (or share units) fully vested and expected to vest at the date of the latest statement of financial position. + 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=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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