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Share-Based Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of stock option activity | A summary of stock option activity is as follows:
| Shares (000) |  | Wtd. Avg. Exercise Price Per Share |  | Wtd. Avg. Remaining Contractual Term (years) | Aggregate Intrinsic Value (in millions) |
Outstanding, January 1, 2016 | 1,272 |  |  | $64 |  |  |
Granted | 166 |  | 75 |  |  |
Exercised | (279 | ) | 63 |  |  |  | $5 |
Expired or cancelled | (32 | ) | 67 |  |  |
Outstanding, December 31, 2016 | 1,127 |  |  | $66 |  | 4.9 |  | $26 |
Vested or expected to vest, December 31, 2016 | 1,122 |  |  | $66 |  | 4.9 |
Exercisable, December 31, 2016 | 756 |  |  | $62 |  | 3.3 |  | $20 |
Outstanding, January 1, 2017 | 1,127 |  |  | $66 |  |  |
Granted | 145 |  | 97 |  |  |
Exercised | (680 | ) | 64 |  |  |  | $24 |
Expired or cancelled | (18 | ) | 75 |  |  |
Outstanding, December 31, 2017 | 574 |  |  | $77 |  | 7.1 |  | $28 |
Vested or expected to vest, December 31, 2017 | 571 |  |  | $77 |  | 7.1 |
Exercisable, December 31, 2017 | 220 |  |  | $65 |  | 5.3 |  | $14 |
Outstanding, January 1, 2018 | 574 |  |  | $77 |  |  |
Granted | 122 |  | 123 |  |  |
Exercised | (24 | ) | 78 |  |  |  | $1 |
Expired or cancelled | — |  | — |  |  |
Outstanding, December 31, 2018 | 672 |  |  | $85 |  | 5.9 |  | $1 |
Vested or expected to vest, December 31, 2018 | 670 |  |  | $85 |  | 5.9 |
Exercisable, December 31, 2018 | 401 |  |  | $76 |  | 4.5 |  | $1 |
Schedule of options outstanding and exercisable | Options outstanding and exercisable as of December 31, 2018 were as follows:
| Options Outstanding |  |  | Options Exercisable |
Exercise Price | Shares (000) |  | Weighted- Average Remaining Contractual Life (years) | Weighted- Average Exercise Price |  |  | Shares (000) |  | Weighted-Average Exercise Price |
$27-$49 | 35 |  | 1.8 |  | $39 |  |  | 35 |  |  | $39 |
$50-$73 | 67 |  | 2.8 | 55 |  |  | 67 |  | 55 |
$74-$85 | 309 |  | 5.8 | 77 |  |  | 223 |  | 77 |
$86-$123 | 261 |  | 7.4 | 109 |  |  | 76 |  | 105 |
| 672 |  | 5.9 |  | $85 |  |  | 401 |  |  | $76 |
Assumptions used to estimate fair value of share awards | We estimated the fair value of each stock option on the date of grant using the Black-Scholes option pricing model and the following assumptions:
Year Ended December 31 | 2018 |  | 2017 |  | 2016 |
Average risk-free interest rate | 2.6 | % | 2.0 | % | 1.4 | %
Expected dividend yield | 1.6 | % | 2.0 | % | 2.1 | %
Expected volatility | 27.0 | % | 31.0 | % | 33.0 | %
Expected term (years) | 6.0 |  | 6.0 |  | 6.0 |
Summary of restricted stock activity | A summary of restricted stock activity is as follows:
| Shares (000) |  | Wtd. Avg. Price Per Share |  | Wtd. Avg. Remaining Contractual Term (years) | Aggregate Intrinsic Value (in millions) |
Unvested, January 1, 2016 | 405 |  |  | $64 |  | 1.3 |
Granted | 232 |  | 75 |  |  |
Vested | (172 | ) | 62 |  |  |
Forfeited | (14 | ) | 76 |  |  |
Unvested, December 31, 2016 | 451 |  |  | $70 |  | 1.4 |
Granted | 167 |  |  | $98 |  |  |
Vested | (133 | ) | 79 |  |  |
Forfeited | (37 | ) | 80 |  |  |
Unvested, December 31, 2017 | 448 |  |  | $77 |  | 1.2 |
Granted | 145 |  |  | $119 |  |  |
Vested | (174 | ) | 77 |  |  |
Forfeited | (23 | ) | 89 |  |  |
Unvested, December 31, 2018 | 396 |  |  | $92 |  | 1.3 |  | $26 |
Summary of performance share units detail by grant year | A summary of the performance share units detail by grant year is as follows:
| 2015 |  | 2016 |  | 2017 |  | 2018 |
Grant Date(s) | February 11, 2015 |  | February 16, 2016 |  | February 9, 2017 |  | February 15, 2018 |
Performance Period (years) | 2015-2017 |  | 2016-2018 |  | 2017-2019 |  | 2018-2020 |
Vesting Date | February 2018 |  | February 2019(a) |  | February 2020(a) |  | February 2021(a) |
Payout Levels (in units): |  |  |  |
Threshold Award | 82,298 |  | 65,141 |  | 57,563 |  | 47,003 |
Target Award | 164,595 |  | 130,282 |  | 115,125 |  | 94,005 |
Outstanding Award | 329,190 |  | 260,564 |  | 230,250 |  | 188,010 |
Shares Issued in 2018 | 219,519 |  | — |  | — |  | — |
Payout Achieved Over Performance Period | — |  | 123,767 |  | — |  | — |
(a) 2016, 2017 and 2018 awards are scheduled to vest in February 2019, 2020, and 2021, respectively, when the Executive Compensation and Human Resources Committee of the Board of Directors determines the achievement of the performance criteria.

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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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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 Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -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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