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Stock-based Compensation (Tables)
 12 Months Ended
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