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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