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Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2018
Compensation And Retirement Disclosure [Abstract]  
Pension and Postretirement Plans
An analysis of the projected benefit obligations for our pension plans and accumulated benefit obligations for
our postretirement health and life insurance plans follows:
Millions of Dollars
Pension BenefitsOther Benefits
2018201720182017
U.S.Int’l.U.S.Int’l.
Change in Benefit Obligation
Benefit obligation at January 1$3,2363,8453,4163,445265286
Service cost8381897712
Interest cost9910711810389
Plan participant contributions-2-22223
Plan amendments-7----
Actuarial (gain) loss(44)(259)24452(10)12
Benefits paid(507)(143)(631)(117)(67)(68)
Curtailment(4)(3)----
Settlement(730)-----
Recognition of termination benefits3-----
Foreign currency exchange rate change-(199)-283(1)1
Benefit obligation at December 31*$2,1363,4383,2363,845218265
*Accumulated benefit obligation portion of above at1,9693,0663,0763,404
December 31:$
Change in Fair Value of Plan Assets
Fair value of plan assets at January 1$2,5413,6472,0813,068--
Actual return on plan assets(112)(106)336313--
Company contributions1441567551144545
Plan participant contributions-2-22223
Benefits paid(507)(143)(631)(117)(67)(68)
Settlement(730)-----
Foreign currency exchange rate change-(198)-267--
Fair value of plan assets at December 31$1,3363,3582,5413,647--
Funded Status$(800)(80)(695)(198)(218)(265)
Amounts Recognized in the Consolidated Balance Sheet
Millions of Dollars
Pension BenefitsOther Benefits
2018201720182017
U.S.Int’l.U.S.Int’l.
Amounts Recognized in the
Consolidated Balance Sheet at
December 31
Noncurrent assets$-232-205--
Current liabilities(59)(4)(38)(4)(44)(45)
Noncurrent liabilities(741)(308)(657)(399)(174)(220)
Total recognized$(800)(80)(695)(198)(218)(265)
Weighted-Average Assumptions Used to
Determine Benefit Obligations at
December 31
Discount rate4.25%3.053.552.804.053.30
Rate of compensation increase4.003.654.003.75--
Weighted-Average Assumptions Used to
Determine Net Periodic Benefit Cost for
Years Ended December 31
Discount rate3.80%2.903.803.003.303.60
Expected return on plan assets5.804.306.555.05--
Rate of compensation increase4.003.754.003.85--
Before tax amounts unrecognized in net periodic postretirement benefit cost
Included in accumulated other comprehensive income (loss) at December 31 were the following before-tax  
amounts that had not been recognized in net periodic benefit cost:
Millions of Dollars
Pension BenefitsOther Benefits
2018201720182017
U.S.Int’l.U.S.Int’l.
Unrecognized net actuarial (gain) loss$516310588358(21)(12)
Unrecognized prior service cost (credit)-(4)-(16)(216)(249)
Sources of change in other comprehensive income
Millions of Dollars
Pension BenefitsOther Benefits
2018201720182017
U.S.Int’l.U.S.Int’l.
Sources of Change in Other
Comprehensive Income (Loss)
Net gain (loss) arising during the period$(177)17(40)7110(12)
Amortization of (gain) loss included in
income (loss)*2493120050(1)(3)
Net change during the period$72481601219(15)
Prior service credit (cost) arising during the
period$-(7)-2--
Amortization of prior service cost (credit)
included in income (loss)-(5)4(6)(35)(36)
Net change during the period$-(12)4(4)(35)(36)
*Includes settlement losses recognized in 2018 and 2017.
Amounts included in accumulated other comprehensive income that are expected to be amortized into net periodic postretirement cost
Included in accumulated other comprehensive loss at December 31, 2018, were the following before-tax
amounts that are expected to be amortized into net periodic benefit cost during 2019:
Millions of Dollars
PensionOther
BenefitsBenefits
U.S.Int’l.
Unrecognized net actuarial (gain) loss$5231(2)
Unrecognized prior service credit-(2)(33)
Net periodic benefit cost of all defined benefit plans
The components of net periodic benefit cost of all defined benefit plans are presented in the following table:
Millions of Dollars
Pension BenefitsOther Benefits
201820172016201820172016
U.S.Int’l.U.S.Int’l.U.S.Int’l.
Components of Net
Periodic Benefit Cost
Service cost$8381897710876122
Interest cost991071181031331208913
Expected return on plan
assets(114)(155)(132)(158)(149)(147)---
Amortization of prior
service cost (credit)-(5)4(6)5(6)(35)(36)(34)
Recognized net actuarial
loss (gain)533169508626(1)(3)(2)
Settlements196-131-202----
Curtailment loss----14---1
Net periodic benefit cost$317592796639969(27)(28)(20)
Fair values of our pension plan assets
The fair values of our pension plan assets at December 31, by asset class were as follows: 
Millions of Dollars
U.S.International
Level 1Level 2Level 3TotalLevel 1Level 2Level 3Total
2018
Equity securities
U.S.$74-2094371--371
International80--80241--241
Mutual funds76--76213181-394
Debt securities
Government----889--889
Corporate-2-2----
Mutual funds----363--363
Cash and cash equivalents----71--71
Time deposits----6--6
Derivatives----(17)--(17)
Real estate------124124
Total in fair value hierarchy$2302202522,1371811242,442
Investments measured at net asset value*
Equity securities
Common/collective trusts$---364---153
Debt securities
Corporate--------
Agency and mortgage-backed securities--------
Common/collective trusts---548---641
Cash and cash equivalents---5----
Real estate---80---109
Total**$2302201,2492,1371811243,345
*In accordance with FASB ASC Topic 715, “Compensation—Retirement Benefits,” certain investments that are to be measured at fair value
using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy. The fair value
amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the Change in
Fair Value of Plan Assets.
**Excludes the participating interest in the insurance annuity contract with a net asset value of $84 million and net receivables related to security
transactions of $16 million.

The fair values of our pension plan assets at December 31, by asset class were as follows: 
Millions of Dollars
U.S.International
Level 1Level 2Level 3TotalLevel 1Level 2Level 3Total
2017
Equity securities
U.S.$161-14175440--440
International178--178315--315
Mutual funds146--146292165-457
Debt securities
Government----902--902
Corporate-2-2----
Mutual funds----144--144
Cash and cash equivalents----111--111
Time deposits----3--3
Derivatives----5--5
Real estate------123123
Total in fair value hierarchy$4852145012,2121651232,500
Investments measured at net asset value*
Equity securities
Common/collective trusts$---805---183
Debt securities
Corporate-------172
Agency and mortgage-backed securities-------15
Common/collective trusts---1,042---648
Cash and cash equivalents---17---24
Real estate---74---94
Total**$4852142,4392,2121651233,636
*In accordance with FASB ASC Topic 715, “Compensation—Retirement Benefits,” certain investments that are to be measured at fair value
using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy. The fair value
amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the Change in
Fair Value of Plan Assets.
**Excludes the participating interest in the insurance annuity contract with a net asset value of $ million and net payables related to security
transactions of $ million.
Benefit payments excluding the participating annuity contract and which reflect expected future service, as appropriate, are expected to be paid:
The following benefit payments, which are exclusive of amounts to be paid from the insurance annuity contract
and which reflect expected future service, as appropriate, are expected to be paid:
Millions of Dollars
PensionOther
BenefitsBenefits
U.S.Int’l.
2019$40012336
202025112934
202123213730
202222213827
202321614324
2024–202788078869
Share-based compensation expense recognized in income and the associated tax benefit
Compensation Expense—Total share-based compensation expense recognized in income (loss) and the
associated tax benefit for the years ended December 31 were as follows:
Millions of Dollars
201820172016
Compensation cost$265227272
Tax benefit 647692
Significant assumptions used to calculate the fair market values
The fair market values of the options granted in 2017 and 2016 were measured on the date of grant using the
Black-Scholes-Merton option-pricing model. The weighted-average assumptions used were as follows:
20172016
Assumptions used
Risk-free interest rate2.24%1.55
Dividend yield4.00%4.00
Volatility factor28.12%26.80
Expected life (years)6.396.37
Summary of stock option activity
The following summarizes our stock option activity for the year ended December 31, 2018:
Millions of Dollars
Weighted-AverageAggregate
OptionsExercise PriceIntrinsic Value
Outstanding at December 31, 201724,722,803$52.18$177
Exercised(3,903,130)45.7194
Forfeited(84,694)58.23
Expired or cancelled(1,355,302)60.53
Outstanding at December 31, 201819,379,677$52.88$214
Vested at December 31, 201818,820,388$53.16$204
Exercisable at December 31, 201816,213,002$54.89$152
Summary of restricted stock unit activity
The following summarizes our stock-settled stock unit activity for the year ended December 31, 2018:
Weighted-Average Millions of Dollars
Stock UnitsGrant Date Fair Value Total Fair Value
Outstanding at December 31, 20177,826,852$45.75
Granted2,465,10052.45
Forfeited(173,265)45.72
Issued(2,571,714)$154
Outstanding at December 31, 20187,546,973$43.41
Not Vested at December 31, 20185,090,20943.69

The following summarizes our cash-settled stock unit activity for the year ended December 31, 2018:
Weighted-Average Millions of Dollars
Stock UnitsGrant Date Fair Value Total Fair Value
Outstanding at December 31, 2017-$-
Granted393,57153.68
Forfeited(3,849)59.17
Issued(13,114)$1
Outstanding at December 31, 2018376,608$62.21
Not Vested at December 31, 201890,25462.21
Summary of Performance Share Program activity
The following summarizes our stock-settled Performance Share Program activity for the year ended
December 31, 2018:
Weighted-Average Millions of Dollars
Stock UnitsGrant Date Fair Value Total Fair Value
Outstanding at December 31, 20172,753,465$50.79
Granted19,70853.28
Forfeited(2,859)48.89
Issued(434,772)$29
Outstanding at December 31, 20182,335,542$50.45
Not Vested at December 31, 201858,914$48.41

The following summarizes our cash-settled Performance Share Program activity for the year ended
December 31, 2018:
Weighted-Average Millions of Dollars
Stock UnitsGrant Date Fair Value Total Fair Value
Outstanding at December 31, 20171,214,533$55.19
Granted321,96553.28
Forfeited(9,282)59.17
Settled(396,209)$22
Outstanding at December 31, 20181,131,007$62.21
Not Vested at December 31, 201887,900$62.21
Summary of aggregate activity of restricted shares and units
The following summarizes the aggregate activity of these restricted shares and units for the year ended
December 31, 2018:
Weighted-Average Millions of Dollars
Stock UnitsGrant Date Fair Value Total Fair Value
Outstanding at December 31, 20171,301,040$45.77
Granted70,92262.01
Cancelled(1,334)23.09
Issued(263,313)$17
Outstanding at December 31, 20181,107,315$46.57
Not Vested at December 31, 2018-
Severance accrual
Millions of Dollars
Balance at December 31, 2017$53
Accruals70
Benefit payments(73)
Foreign currency translation adjustments(2)
Balance at December 31, 2018$48