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Incentive Plans (Tables)
 12 Months Ended
Dec. 31, 2016
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]  
Summary Of Stock Option Program [Table Text Block]
The following summarizes the status of the Stock Option Program and the changes during the three years ending December 31, 2016: 
 
Options
(a)
Weighted
Average
Exercise
Price
Weighted
Average
Remaining
Life
(years)
Aggregate
Intrinsic
Value
(thousands)
Outstanding at December 31, 2013
1,752,789


$39.80

0.67

$16,175

Granted
3,247

49.13

 
 
Exercised
(1,634,858
)
39.80

 
 
Expired
(49,286
)
41.50

 
 
Outstanding at December 31, 2014
71,892

39.03

0.18
1,046

Granted
—

—

 
 
Exercised
(62,477
)
39.05

 
 
Expired
(9,415
)
38.92

 
 
Outstanding at December 31, 2015
—

—

0.00
—

Granted
—

—

 
 
Exercised
—

—

 
 
Expired
—

—

 
 
Outstanding at December 31, 2016
—


$—

0.00

$—



(a)
The table includes options outstanding under an acquired company plan under which options may no longer be granted.
Assumptions Used To Determine Compensation Cost For Market Condition Component Of Performance Share Program [Table Text Block]
The following table sets forth the assumptions used to determine compensation cost for the market condition component of the PSP plan: 
  
Twelve Months Ended December 31, 2016
Expected volatility
22.36%-30.84%
Risk-free interest rate
0.67%-1.31%
Summary Of Performance Restricted Share Activity [Table Text Block]
The following summarizes PSP activity for the three years ending December 31, 2016: 
 
Share/Units
Weighted
Average
Grant Date
Fair Value
Outstanding at December 31, 2013
8,117,489


$31.20

Granted
3,682,663

46.82

Shares issued
(4,025,111
)
37.18

Forfeited
(499,107
)
43.10

Outstanding at December 31, 2014
7,275,934

34.98

Granted
1,863,623

53.25

Shares issued
(2,959,160
)
37.09

Forfeited
(322,664
)
53.97

Outstanding at December 31, 2015
5,857,733

38.69

Granted
2,617,982

37.26

Shares issued
(2,316,085
)
43.82

Forfeited
(209,500
)
43.61

Outstanding at December 31, 2016
5,950,130


$35.89
Summary Of Activity Of Executive Continuity And Restricted Stock Award Program [Table Text Block]
The following summarizes the activity of the RSA program for the three years ending December 31, 2016: 
 
Shares
Weighted
Average
Grant Date
Fair Value
Outstanding at December 31, 2013
112,374


$36.24

Granted
89,500

48.19

Shares issued
(83,275
)
33.78

Forfeited
(4,000
)
45.88

Outstanding at December 31, 2014
114,599

47.03

Granted
36,300

50.06

Shares issued
(27,365
)
45.35

Forfeited
(3,166
)
50.04

Outstanding at December 31, 2015
120,368

48.24

Granted
117,881

42.81

Shares issued
(59,418
)
47.14

Forfeited
(9,500
)
39.36

Outstanding at December 31, 2016
169,331


$45.34
Stock-Based Compensation Expense And Related Income Tax Benefits [Table Text Block]
Stock-based compensation expense and related income tax benefits were as follows:
In millions
2016
2015
2014
Total stock-based compensation expense (included in selling and administrative expense)
$
129

$
114

$
118

Income tax benefits related to stock-based compensation
34

88

92