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Stock-based Compensation (Tables)
 12 Months Ended
Dec. 31, 2014
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, 2014, 2013, and 2012.
 
Year Ended December 31
Millions of dollars
2014
2013
2012
Stock-based compensation cost
$
298

$
264

$
217

Tax benefit
(90
)
(81
)
(67
)
Stock-based compensation cost, net of tax
$
208

$
183

$
150
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
 
2014
2013
2012
Expected volatility
23
%
27
%
49
%
Expected dividend yield
1.07
%
1.12
%
1.16
%
Risk-free interest rate
0.04
%
0.06
%
0.11
%
Weighted average grant-date fair value per share
$
11.80

$
8.40

$
8.93

The assumptions and resulting fair values of options granted were as follows:

 
Year Ended December 31
 
2014
2013
2012
Expected term (in years)
5.23
5.27
5.21
Expected volatility
37%
40%
46%
Expected dividend yield
0.94 - 1.77%
0.94 - 1.33%
0.99 – 1.24%
Risk-free interest rate
1.57 - 1.86%
0.77 - 1.73%
0.65 – 1.15%
Weighted average grant-date fair value per share
$19.26
$14.34
$11.99
Stock Options  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
The following table represents our stock options activity during 2014.
 
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, 2014
18.1

$
36.57

 
 
Granted
5.2

59.43

 
 
Exercised
(5.4
)
34.62

 
 
Forfeited/expired
(0.5
)
44.17

 
 
Outstanding at December 31, 2014
17.4

$
43.74

7.3
$
56

Exercisable at December 31, 2014
7.7

$
35.83

5.6
$
45
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 following table represents our restricted stock awards and restricted stock units granted, vested, and forfeited during 2014.
 
Number of Shares
(in millions)
Weighted Average
Grant-Date Fair
Value per Share
Nonvested shares at January 1, 2014
15.7

$
37.43

Granted
6.2

58.21

Vested
(4.7
)
35.10

Forfeited
(1.1
)
41.63

Nonvested shares at December 31, 2014
16.1

$
45.88