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EMPLOYEE STOCK BENEFIT PLANS (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block]
Other information related to stock-based compensation benefits are as follows:
 
 
Years Ended December 31,
Dollars in Millions
 
2017
 
2016
 
2015
Restricted stock units
 
$
95

 
$
89

 
$
82

Market share units
 
35

 
37

 
36

Performance share units
 
69

 
79

 
117

Total stock-based compensation expense
 
$
199

 
$
205

 
$
235

 
 
 
 
 
 
 
Income tax benefit
 
$
59

 
$
69

 
$
77
Share-based Compensation, Activity [Table Text Block]
 
 
Stock Options
 
Restricted Stock Units
 
Market Share Units
 
Performance Share Units
 
 
Number of
Options Outstanding
 
Weighted-
Average
Exercise Price of Shares
 
Number
of
Nonvested Awards
 
Weighted-
Average
Grant-Date Fair Value
 
Number
of
Nonvested Awards
 
Weighted-
Average
Grant-Date Fair Value
 
Number
of
Nonvested Awards
 
Weighted-
Average
Grant-Date Fair Value
Shares in Millions
 
 
 
 
 
 
 
 
Balance at January 1, 2017
 
6.4

 
$
21.02

 
4.6

 
$
56.90

 
1.5

 
$
61.63

 
4.1

 
$
60.97

Granted
 
—

 
—

 
2.7

 
54.39

 
0.9

 
60.14

 
1.3

 
57.91

Released/Exercised
 
(2.5
)
 
23.80

 
(1.7
)
 
53.00

 
(0.6
)
 
54.64

 
(1.5
)
 
54.46

Adjustments for actual payout
 
—

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Forfeited/Canceled
 
(0.1
)
 
25.55

 
(0.7
)
 
57.26

 
(0.3
)
 
62.95

 
(0.4
)
 
62.21

Balance at December 31, 2017
 
3.8

 
19.04

 
4.9

 
56.85

 
1.5

 
62.25

 
3.5

 
62.57

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Vested or expected to vest
 
3.8

 
19.04

 
4.3

 
56.89

 
1.4

 
62.27

 
3.3

 
62.82
Schedule of Unrecognized Compensation Cost, Nonvested Awards [Table Text Block]

 
 
Restricted
 
Market
 
Performance
Dollars in Millions
 
Stock Units
 
Share Units
 
Share Units
Unrecognized compensation cost
 
$
197

 
$
42

 
$
70

Expected weighted-average period in years of compensation cost to be recognized
 
2.7

 
2.8

 
1.7
Schedule Of Share Based Compensation Additional Information [Table Text Block]


Amounts in Millions, except per share data
 
2017
 
2016
 
2015
Weighted-average grant date fair value (per share):
 
 
 
 
 
 
Restricted stock units
 
$
54.39

 
$
60.56

 
$
61.18

Market share units
 
60.14

 
65.26

 
67.03

Performance share units
 
57.91

 
64.87

 
65.07

 
 
 
 
 
 
 
Fair value of awards that vested:
 
 
 
 
 
 
Restricted stock units
 
$
91

 
$
81

 
$
77

Market share units
 
33

 
50

 
47

Performance share units
 
84

 
93

 
75

 
 
 
 
 
 
 
Total intrinsic value of stock options exercised
 
$
84

 
$
158

 
$
206
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding and Exercisable [Table Text Block]
The following table summarizes significant ranges of outstanding and exercisable options at December 31, 2017:
 
 
Options Outstanding and Exercisable
 Range of Exercise Prices
 
Number
Outstanding and Exercisable (in millions)
 
Weighted-Average
Remaining Contractual
Life (in years)
 
Weighted-Average
Exercise Price 
Per Share
 
Aggregate
Intrinsic Value
(in millions)
$17 - $24
 
3.8

 
0.83
 
$
19.04

 
$
160