XML 54 R34.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Stock-based Compensation (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2017
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, 2017, 2016 and 2015.
| Year Ended December 31
Millions of dollars | 2017 | 2016 | 2015
Stock-based compensation cost | $ | 290 |  | $ | 262 |  | $ | 294 |
Tax benefit | (64 | ) | (77 | ) | (99 | )
Stock-based compensation cost, net of tax | $ | 226 |  | $ | 185 |  | $ | 195 |
Stock Options |
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 of options granted were as follows:
| Year Ended December 31
| 2017 | 2016 | 2015
Expected term (in years) | 5.24 | 5.21 | 5.16
Expected volatility | 32% | 37% | 39%
Expected dividend yield | 1.28 - 1.72% | 1.35 - 2.46% | 1.51 - 1.85%
Risk-free interest rate | 1.79 - 2.14% | 1.13 - 1.84% | 1.43 - 1.72%
Weighted average grant-date fair value per share | $13.11 | $12.33 | $13.47
Share-based Compensation, Stock Options, Activity [Table Text Block] | The following table represents our stock options activity during 2017.
| 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, 2017 | 20.6 |  | $ | 44.01 |  |  |
Granted | 2.5 |  | 48.39 |  |  |
Exercised | (1.4 | ) | 36.60 |  |  |
Forfeited/expired | (0.7 | ) | 47.99 |  |  |
Outstanding at December 31, 2017 | 21.0 |  | $ | 44.92 |  | 6.3 | $ | 138 |
Exercisable at December 31, 2017 | 15.0 |  | $ | 45.04 |  | 5.4 | $ | 105 |
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 2017.
| Number of Shares (in millions) | Weighted Average Grant-Date Fair Value per Share
Nonvested shares at January 1, 2017 | 15.1 |  | $ | 44.96 |
Granted | 5.6 |  | 45.99 |
Vested | (4.5 | ) | 44.40 |
Forfeited | (1.1 | ) | 46.25 |
Nonvested shares at December 31, 2017 | 15.1 |  | $ | 45.42 |
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
| 2017 | 2016 | 2015
Expected volatility | 29 | % | 36 | % | 35 | %
Expected dividend yield | 1.51 | % | 1.87 | % | 1.82 | %
Risk-free interest rate | 0.86 | % | 0.25 | % | 0.01 | %
Weighted average grant-date fair value per share | $ | 9.95 |  | $ | 8.61 |  | $ | 8.62 |

X
- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfCompensationCostForShareBasedPaymentArrangementsAllocationOfShareBasedCompensationCostsByPlanTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_EmployeeStockOptionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_RestrictedStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_EmployeeStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |