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Share-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Restricted Stock | Shares of restricted stock granted at Dec. 31:
(Shares in Thousands) |  | 2018 |  | 2017 |  | 2016
Granted shares |  | 18 |  |  | 15 |  |  | 20 |
Grant date fair value |  | $ | 44.68 |  |  | $ | 42.00 |  |  | $ | 38.82 |
Changes in nonvested restricted stock:
(Shares in Thousands) |  | Shares |  | Weighted Average Grant Date Fair Value
Nonvested restricted stock at Jan. 1, 2018 |  | 44 |  |  | $ | 39.71 |
Granted |  | 18 |  |  | 44.68 |
Forfeited |  | — |  |  | — |
Vested |  | (27 | ) |  | 37.25 |
Dividend equivalents |  | 1 |  |  | 46.27 |
Nonvested restricted stock at Dec. 31, 2018 |  | 36 |  |  | 44.29 |
Other Equity Awards | Equity award units granted to employees (excluding restricted stock):
(Units in Thousands) |  | 2018 |  | 2017 |  | 2016
Granted units |  | 500 |  |  | 503 |  |  | 522 |
Weighted average grant date fair value |  | $ | 47.60 |  |  | $ | 41.02 |  |  | $ | 36.00 |
Equity awards vested:
(Units in Thousands) |  | 2018 |  | 2017 |  | 2016
Vested Units |  | 475 |  |  | 467 |  |  | 530 |
Total Fair Value |  | $ | 23,393 |  |  | $ | 22,459 |  |  | $ | 21,575 |
Changes in the nonvested portion of equity award units for 2018:
(Units in Thousands) |  | Units |  | Weighted Average Grant Date Fair Value
Nonvested Units at Jan. 1, 2018 |  | 995 |  |  | $ | 38.48 |
Granted |  | 500 |  |  | 47.60 |
Forfeited |  | (126 | ) |  | 41.74 |
Vested |  | (475 | ) |  | 35.92 |
Dividend equivalents |  | 45 |  |  | 40.74 |
Nonvested Units at Dec. 31, 2018 |  | 939 |  |  | 44.30 |
Stock Equivalent Unit Plan | Stock equivalent units granted:
(Units in Thousands) |  | 2018 |  | 2017 |  | 2016
Granted units |  | 36 |  |  | 51 |  |  | 49 |
Weighted average grant date fair value |  | $ | 45.44 |  |  | $ | 46.05 |  |  | $ | 40.68 |
Changes in stock equivalent units:
(Units in Thousands) |  | Units |  | Weighted Average Grant Date Fair Value
Stock equivalent units at Jan. 1, 2018 |  | 753 |  |  | $ | 29.83 |
Granted |  | 36 |  |  | 45.44 |
Units distributed |  | (123 | ) |  | 31.21 |
Dividend equivalents |  | 22 |  |  | 46.40 |
Stock equivalent units at Dec. 31, 2018 |  | 688 |  |  | 30.93 |
TSR Liability Awards | TSR liability awards granted:
(In Thousands) |  | 2018 |  | 2017 |  | 2016
Awards granted |  | 239 |  |  | 240 |  |  | 264 |
TSR liability awards settled:
(In Thousands) |  | 2018 |  | 2017 |  | 2016
Awards settled |  | 482 |  |  | 454 |  |  | 354 |
Settlement amount (cash, common stock and deferred amounts) |  | $ | 21,534 |  |  | $ | 19,083 |  |  | $ | 13,724 |
Compensation costs related to share-based awards | Compensation costs related to share-based awards:
(Millions of Dollars) |  | 2018 |  | 2017 |  | 2016
Compensation cost for share-based awards (a) |  | $ | 45 |  |  | $ | 57 |  |  | $ | 41 |
Tax benefit recognized in income |  | 12 |  |  | 22 |  |  | 16 |
(a) | Compensation costs for share-based payment are included in O&M expense.

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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