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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 Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
Weighted-Average Assumptions
2017
2016
2015
Dividend yield
3.01
%
4.13
%
3.54
%
Expected volatility
23.71
%
31.60
%
27.84
%
Risk-free interest rate
1.28
%
1.12
%
1.02
%
Expected life of stock options granted during period (years)
7.5

7.8

7.7

Life of Employee Stock Purchase Plan (months)
3

4

6
Restricted Stock Issued [Table Text Block]
Restricted Stock
Shares Issued
(in thousands)
Weighted-Average Fair Value
Year
2017
33

$
62.04

2016
32

$
50.55

2015
32

$
51.51
Employee Stock Option [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Share-based Compensation, Stock Options, Activity [Table Text Block]
Stock Options
2017
Shares in thousands
Shares
Exercise
Price 1
Outstanding at Jan 1, 2017
34,770

$
36.20

Granted
2,221

$
61.19

Exercised
(10,194
)
$
36.02

Forfeited/Expired
(169
)
$
43.75

Outstanding at Dec 31, 2017
26,628

$
38.30

Remaining contractual life in years

5.10

Aggregate intrinsic value in millions
$
877



Exercisable at Dec 31, 2017
22,019

$
35.16

Remaining contractual life in years

4.43

Aggregate intrinsic value in millions
$
794



1. Weighted-average per share.
Schedule of value of stock option plans
Additional Information about Stock Options
 
 
 
In millions, except per share amounts
2017
2016
2015
Weighted-average fair value per share of options granted
$
14.44

$
10.95

$
11.61

Total compensation expense for stock option plans
$
37

$
32

$
55

Related tax benefit
$
14

$
12

$
20

Total amount of cash received from the exercise of options
$
310

$
312

$
377

Total intrinsic value of options exercised 1
$
286

$
153

$
175

Related tax benefit
$
106

$
57

$
65


1. Difference between the market price at exercise and the price paid by the employee to exercise the options.
Deferred Stock [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Nonvested Performance-based Units Activity [Table Text Block]
Deferred Stock
2017
Shares in thousands
Shares
Grant  Date
Fair Value 1
Nonvested at Jan 1, 2017
6,382

$
47.49

Granted
1,709

$
61.29

Vested
(2,804
)
$
47.60

Canceled
(112
)
$
50.14

Conversion of performance deferred stock awards at Conversion Date
8,171

$
49.94

Nonvested at Dec 31, 2017
13,346

$
50.71

1. Weighted-average per share.
Schedule of value of deferred stock [Text Block]
Additional Information about Deferred Stock
 
 
 
In millions, except per share amounts
2017
2016
2015
Weighted-average fair value per share of deferred stock granted
$
61.29

$
46.25

$
49.42

Total fair value of deferred stock vested
$
179

$
166

$
162

Related tax benefit
$
66

$
61

$
60

Total compensation expense for deferred stock awards
$
178

$
97

$
110

Related tax benefit
$
66

$
36

$
41
Performance Deferred Stock Awards [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Nonvested Performance-based Units Activity [Table Text Block]
Performance Deferred Stock
2017
Shares in thousands
Target
Shares
Granted
Grant Date 
Fair Value 1
Nonvested at Jan 1, 2017
4,454

$
55.85

Granted
1,960

$
80.71

Canceled
(131
)
$
58.91

Converted to deferred stock awards
(6,051
)
$
63.24

Nonvested at Dec 31, 2017
232

$
71.16


1. Weighted-average per share.
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value [Table Text Block]
Performance Deferred Stock Awards
Target
Shares
Granted 1
Grant Date
Fair Value 2
Shares in thousands
Year
Performance Period
2017
Sep 1, 2017 – Aug 31, 2019
232

$
71.16

2017 3
Jan 1, 2017 – Dec 31, 2019
1,728

$
81.99

2016 3
Jan 1, 2016 – Dec 31, 2018
2,283

$
52.68

2015 3
Jan 1, 2015 – Dec 31, 2017
2,258

$
59.08


1. At the end of the performance period, the actual number of shares issued can range from zero to 200% of target shares granted.
2. Weighted-average per share.
3. Converted to deferred stock as a result of the Merger.
Schedule of Additional Information About Performance Deferred Stock [Table Text Block]
Additional Information about Performance Deferred Stock
 
 
 
In millions, except share amounts
2017
2016
2015
Total fair value of performance deferred stock vested and delivered 1
$
202

$
103

$
37

Related tax benefit
$
75

$
38

$
14

Total compensation expense for performance deferred stock awards
$
106

$
125

$
172

Related tax benefit
$
39

$
46

$
63

Shares of performance deferred stock settled in cash (in thousands) 2
616

861

327

Total cash paid to settle performance deferred stock awards 3
$
38

$
40

$
16

1. Includes the fair value of shares vested in prior years and delivered in the reporting year.
2. Performance deferred stock awards vested in prior years and delivered in the reporting year.
3. Cash paid to certain executive employees for performance deferred stock awards vested in prior periods and delivered in the reporting year, equal to the value of the stock award on the date of delivery.
Employees' Stock Purchase Plan [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share-based Compensation, Employee Stock Purchase Plan, Activity [Table Text Block]
Additional Information about Employee Stock Purchase Plan
 
 
 
In millions, except per share amounts
2017
2016
2015
Weighted-average fair value per share of purchase rights granted
$
10.70

$
3.40

$
4.62

Total compensation expense for ESPP
$
38

$
7

$
15

Related tax benefit
$
14

$
3

$
5

Total amount of cash received from the exercise of purchase rights
$
179

$
86

$
131

Total intrinsic value of purchase rights exercised 1
$
48

$
23

$
25

Related tax benefit
$
18

$
9

$
9

1. Difference between the market price at exercise and the price paid by the employee to exercise the purchase rights.
Schedule of value of employees' stock purchase plan
Employee Stock Purchase Plan
2017
Shares in thousands
Shares
Exercise
Price 1
Outstanding and exercisable at Jan 1, 2017
—

$
—

Granted
3,578

$
50.22

Exercised
(3,560
)
$
50.22

Forfeited/Expired
(18
)
$
50.22

Outstanding and exercisable at Dec 31, 2017
—

$
—

1. Weighted average price per share.