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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] |
Rollforward of stock options | The following table summarizes the status of, and changes in, our stock options during 2017.
| Options |  | Weighted- average exercise price |  | Weighted-average remaining contractual term in years
Outstanding at December 31, 2016 | 24,364,322 |  |  | $ | 61.90 |  |  |
Exercised | (8,977,164 | ) |  | $ | 53.04 |  |  |
Forfeited | (126,404 | ) |  | $ | 75.16 |  |  |
Expired | (39,631 | ) |  | $ | 76.06 |  |  |
Outstanding at December 31, 2017 | 15,221,123 |  |  | $ | 66.98 |  |  | 5.1
Exercisable at December 31, 2017 | 11,140,190 |  |  | $ | 63.79 |  |  | 4.5
Rollforward of nonvested restricted shares and restricted stock units | The following table summarizes the status of, and changes in, our nonvested restricted shares and restricted stock units during 2017.
| Restricted shares |  | Restricted stock units |  | Weighted- average fair value
Nonvested at December 31, 2016 | 931,508 |  |  | 4,634,461 |  |  | $ | 72.19 |
Time-based grants | 17,022 |  |  | 2,026,176 |  |  | $ | 100.24 |
Performance-based grants | — |  |  | 114,454 |  |  | $ | 101.79 |
Vested (value at vest date was $164.5 million) | (455,958 | ) |  | (1,111,857 | ) |  | $ | 71.77 |
Forfeited | (19,457 | ) |  | (106,323 | ) |  | $ | 72.32 |
Nonvested at December 31, 2017 | 473,115 |  |  | 5,556,911 |  |  | $ | 82.37 |
Future stock-based compensation expense | The following table presents the compensation expense (in millions) to be recognized over the remaining vesting periods of the stock-based awards outstanding at December 31, 2017. Estimated future compensation expense will change to reflect future grants changes in the probability of performance thresholds being met, and adjustments for actual forfeitures.
First quarter 2018 | $ | 47.3 |
Second quarter 2018 | 46.7 |
Third quarter 2018 | 46.0 |
Fourth quarter 2018 | 40.3 |
Total 2018 | 180.3 |
2019 through 2023 | 176.1 |
Total | $ | 356.4 |

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: 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=96867065&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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- Definition Tabular disclosure of the total compensation cost related to nonvested awards not yet recognized and the weighted-average period over which it is expected to be recognized. + 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 (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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