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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
($ in millions)
2016
 
2015
 
2014
Total stock-based compensation
$
39

 
$
54

 
$
71

Income tax benefit recognized
$
14

 
$
18

 
$
24
Weighted Average Assumptions Used in Calculating the Fair Value of Stock Option
The following weighted average assumptions were used to calculate the fair values of stock option grants in each year:
 
2016
 
2015
 
2014
Weighted average exercise price
$
95.29

 
$118.02
 
$93.61
Risk free interest rate
1.6
%
 
1.9
%
 
2.1
%
Expected life of option in years
6.5

 
6.5

 
6.5

Expected dividend yield
2.1
%
 
2.7
%
 
3.0
%
Expected volatility
22.8
%
 
29.2
%
 
30.1
%
Stock Options Outstanding, Exercisable and Activity
A summary of stock options outstanding and exercisable and activity for the year ended December 31, 2016 is presented below:
 
Number of
Shares
 
Weighted
Average
Exercise
Price
 
Weighted
Average
Remaining
Contractual
Life
(in years)
 
Intrinsic
Value
(in 
millions)
Outstanding, January 1, 2016
3,729,728

 
$
67.68

 
6.5
 
$
127

Granted
792,079

 
$
95.29

 
 
 
 
Exercised
(611,091
)
 
$
50.08

 
 
 
 
Forfeited/Expired
(29,150
)
 
$
100.22

 
 
 
 
Outstanding, December 31, 2016
3,881,566

 
$
75.84

 
6.5
 
$
86

Vested or expected to vest, December 31, 2016
3,657,738

 
$
66.90

 
6.4
 
$
86

Exercisable, December 31, 2016
1,859,345

 
$
48.43

 
4.6
 
$
86
Stock Option Activity
The following table presents stock option activity for the years ended December 31, 2016, 2015 and 2014:
($ in millions)
2016
 
2015
 
2014
Total intrinsic value of stock options exercised
$
34

 
$
92

 
$
92

Cash received from stock option exercises
$
32

 
$
53

 
$
57

Income tax benefit from the exercise of stock options
$
12

 
$
31

 
$
33

Total fair value of stock options vested
$
16

 
$
13

 
$
10
RSU Activity
The following table summarizes RSU activity for the year ended December 31, 2016: 
 
Number of
Shares
 
Weighted
Average
Fair Value
 
Intrinsic
Value
(in millions)
Outstanding, January 1, 2016
1,094,161

 
$
119.26

 
$
108

Granted
265,105

 
$
91.84

 
 
Additional shares vested
94,036

 
$
89.67

 
 
Released from restrictions
(682,850
)
 
$
70.49

 
 
Forfeited
(48,528
)
 
$
86.52

 
 
Outstanding, December 31, 2016
721,924

 
$
95.65

 
$
69

Vested or expected to vest, December 31, 2016
687,385

 
$
95.71

 
$
66