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Stock-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block] | The following table summarizes stock-based compensation costs for the years ended December 31, 2018, 2017 and 2016.
| Year Ended December 31
Millions of dollars | 2018 | 2017 | 2016
Stock-based compensation cost | $ | 274 |  | $ | 290 |  | $ | 262 |
Tax benefit | (51 | ) | (64 | ) | (77 | )
Stock-based compensation cost, net of tax | $ | 223 |  | $ | 226 |  | $ | 185 |
Stock Options |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Share-based Compensation, Stock Options, Activity [Table Text Block] | The following table represents our stock options activity during 2018.
| Number of Shares (in millions) | Weighted Average Exercise Price per Share | Weighted Average Remaining Contractual Term (years) | Aggregate Intrinsic Value (in millions)
Outstanding at January 1, 2018 | 20.9 |  | $ | 44.92 |  |  |
Granted | 3.0 |  | 46.39 |  |  |
Exercised | (2.2 | ) | 40.34 |  |  |
Forfeited/expired | (0.7 | ) | 49.44 |  |  |
Outstanding at December 31, 2018 | 21.0 |  | $ | 45.44 |  | 6.1 | $ | 2 |
Exercisable at December 31, 2018 | 15.6 |  | $ | 45.28 |  | 5.1 | $ | 2 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] | The assumptions and resulting fair values of options granted were as follows:
| Year Ended December 31
| 2018 | 2017 | 2016
Expected term (in years) | 5.27 | 5.24 | 5.21
Expected volatility | 28% | 32% | 37%
Expected dividend yield | 1.37 - 2.29% | 1.28 - 1.72% | 1.35 - 2.46%
Risk-free interest rate | 2.27 - 2.84% | 1.79 - 2.14% | 1.13 - 1.84%
Weighted average grant-date fair value per share | $11.56 | $13.11 | $12.33
Restricted Stock |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] | The following table represents our restricted stock awards and restricted stock units granted, vested and forfeited during 2018.
| Number of Shares (in millions) | Weighted Average Grant-Date Fair Value per Share
Nonvested shares at January 1, 2018 | 15.1 |  | $ | 45.42 |
Granted | 4.9 |  | 47.43 |
Vested | (4.8 | ) | 45.24 |
Forfeited | (0.8 | ) | 46.62 |
Nonvested shares at December 31, 2018 | 14.4 |  | $ | 46.01 |
Employee Stock Purchase Plan |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] | The assumptions and resulting fair values were as follows:
| Year Ended December 31
| 2018 | 2017 | 2016
Expected volatility | 25 | % | 29 | % | 36 | %
Expected dividend yield | 1.62 | % | 1.51 | % | 1.87 | %
Risk-free interest rate | 1.92 | % | 0.86 | % | 0.25 | %
Weighted average grant-date fair value per share | $ | 8.86 |  | $ | 9.95 |  | $ | 8.61 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 3: 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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