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Share-Based Compensation Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2013
Share-based Compensation [Abstract]  
Summary of Components of Share-Based Compensation Expense
The components of share-based compensation expense for all share-based compensation plans and related tax benefits are as follows.
(in millions)
 
 
 
 
 
Years Ended December 31
2013
 
2012
 
2011
Total share-based compensation expense
$
35

 
$
37

 
$
37

Related tax benefits recognized in net income
$
13

 
$
13

 
$
14
Schedule of Unrecognized Compensation Expense
The following table summarizes unrecognized compensation expense for all share-based plans:
(dollar amounts in millions)
December 31, 2013
Total unrecognized share-based compensation expense
$
55

Weighted-average expected recognition period (in years)
2.9
Estimated Weighted-Average Grant-Date Fair Value per Option Share and the Underlying Binomial Option-Pricing Model Assumptions
The estimated weighted-average grant-date fair value per option and the underlying binomial option-pricing model assumptions are summarized in the following table:
Years Ended December 31
2013
 
2012
 
2011
Weighted-average grant-date fair value per option
$
9.07

 
$
8.63

 
$
11.58

Weighted-average assumptions:
 
 
 
 
 
 Risk-free interest rates
1.94
%
 
2.16
%
 
3.43
%
 Expected dividend yield
3.00

 
3.00

 
3.00

Expected volatility factors of the market price of
   Comerica common stock
34

 
39

 
38

Expected option life (in years)
6.4

 
6.1

 
6.1
Summary of Corporation's Stock Option Activity and Related Information
A summary of the Corporation’s stock option activity and related information for the year ended December 31, 2013 follows:
 
 
 
Weighted-Average
 
 
  
Number of
Options
(in thousands)
 
Exercise Price
per Share
 
Remaining
Contractual
Term (in years)
 
Aggregate
Intrinsic Value
(in millions)
Outstanding-January 1, 2013
18,425

 
$
43.58

 
 
 
 
Granted
1,343

 
33.80

 
 
 
 
Forfeited or expired
(1,735
)
 
41.70

 
 
 
 
Exercised
(1,238
)
 
29.23

 
 
 
 
Outstanding-December 31, 2013
16,795

 
43.52

 
4.3

 
$
129

Outstanding, net of expected forfeitures-December 31, 2013
16,479

 
43.72

 
4.3

 
124

Exercisable-December 31, 2013
12,649

 
47.31

 
3.2

 
66
Summary of Restricted Stock Activity and Related Information
A summary of the Corporation’s restricted stock activity and related information for the year ended December 31, 2013 follows:
 
Number of
Shares
(in thousands)
 
Weighted-Average
Grant-Date Fair 
Value per Share
Outstanding-January 1, 2013
2,419

 
$
31.15

Granted
511

 
33.90

Forfeited
(112
)
 
31.65

Vested
(339
)
 
30.53

Outstanding-December 31, 2013
2,479

 
$
31.78
Summary of Restricted Stock Unit Activity and Related Information
A summary of the Corporation's restricted stock unit activity and related information for the year ended December 31, 2013 follows:
 
Service-Based Units
 
Performance-Based Units
 
Number of
Units
(in thousands)
 
Weighted-Average
Grant-Date Fair 
Value per Share
 
Number of
Units
(in thousands)
 
Weighted-Average
Grant-Date Fair 
Value per Share
Outstanding-January 1, 2013
165

 
$
33.56

 
—

 
$
—

Granted
171

 
34.48

 
128

 
33.79

Forfeited
(5
)
 
33.79

 
(4
)
 
33.79

Outstanding-December 31, 2013
331

 
34.01

 
124

 
33.79