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Stock-based compensation (Tables)
12 Months Ended
Dec. 31, 2012
Share-based Compensation [Abstract]  
Stock option, restricted stock unit and employee stock purchase plan transactions
Summarized information as of December 31, 2012, about outstanding stock options that are vested and expected to vest, as well as stock options that are currently exercisable, is as follows:
 
 
Outstanding Stock Options (Fully
Vested and Expected to Vest) (a)
 
Options
Exercisable
Number of outstanding (shares)
 
96,121,395

 
68,534,425

Weighted average remaining contractual life (in years)
 
4.7

 
3.3

Weighted average exercise price per share
 
$
28.75

 
$
27.30

Intrinsic value (millions of dollars)
 
$
398

 
$
300

(a) Includes effects of expected forfeitures of approximately 4 million shares. Excluding the effects of expected forfeitures, the aggregate intrinsic value of stock options outstanding was $414 million.
Stock option and RSU transactions under our long-term incentive and director compensation plans during 2012 were as follows:
 
 
Stock Options
 
RSUs
 
 
Shares
 
Weighted Average
Exercise Price
per Share
 
Shares
 
Weighted Average
Grant Date Fair
Value per Share
Outstanding grants, December 31, 2011
 
113,273,394

 
$
25.79

 
23,358,846

 
$
25.09

Granted
 
13,508,034

 
32.35

 
5,617,150

 
31.60

Vested RSUs
 

 

 
(4,182,928
)
 
28.66

Expired and forfeited
 
(4,732,514
)
 
29.78

 
(1,417,834
)
 
26.76

Exercised
 
(22,409,816
)
 
20.32

 

 

Outstanding grants, December 31, 2012
 
99,639,098

 
$
27.73

 
23,375,234

 
$
25.91

Shares available for future grant and reserved for issuance are summarized below:
 
 
As of December 31, 2012
Shares
 
Long-term Incentive
and Director
Compensation Plans
 
Employee Stock
Purchase Plan
 
Total
Reserved for issuance (a)
 
197,554,600

 
25,137,819

 
222,692,419

Shares to be issued upon exercise of outstanding options and RSUs
 
(123,143,365
)
 
(681,951
)
 
(123,825,316
)
Available for future grants
 
74,411,235

 
24,455,868

 
98,867,103


(a) Includes 129,033 shares credited to directors’ deferred compensation accounts that settle in shares of TI common stock. These shares are not included as grants outstanding at December 31, 2012.
We estimate the fair values for non-qualified stock options under long-term incentive and director compensation plans using the Black-Scholes option-pricing model with the following weighted average assumptions.
 
 
2012
 
2011
 
2010
Weighted average grant date fair value, per share
 
$
8.31

 
$
10.37

 
$
6.61

Weighted average assumptions used:
 
 
 
 

 
 

Expected volatility
 
30
%
 
30
%
 
32
%
Expected lives (in years)
 
7.1

 
6.9

 
6.4

Risk-free interest rates
 
1.40
%
 
2.61
%
 
2.83
%
Expected dividend yields
 
2.10
%
 
1.51
%
 
2.08
%
Total stock-based compensation expense recognized was as follows:
 
 
For Years Ended
 December 31,
 
 
2012
 
2011
 
2010
Stock-based compensation expense recognized in:
 
 
 
 
 
 
Cost of revenue (COR)
 
$
48

 
$
40

 
$
36

Research and development (R&D)
 
71

 
58

 
53

Selling, general and administrative (SG&A)
 
127

 
121

 
101

Acquisition charges
 
17

 
50

 

Total
 
$
263

 
$
269

 
$
190

Employee stock purchase plan transactions during 2012 were as follows:
 
 
Employee Stock
Purchase Plan
(Shares)
 
Exercise Price
Outstanding grants, December 31, 2011
 
580,095

 
$
25.29

Granted
 
2,931,354

 
25.64

Exercised
 
(2,829,498
)
 
25.12

Outstanding grants, December 31, 2012
 
681,951

 
$
27.47

Schedule of share-based compensation, Shares outstanding under stock option plans, by exercise price range
Summarized information about stock options outstanding at December 31, 2012, is as follows:
 
 
 
Stock Options Outstanding
 
Options Exercisable
Range of
Exercise
Price
 
Number
Outstanding
(Shares)
 
Weighted Average
Remaining Contractual
Life (Years)
 
Weighted Average
Exercise Price per
Share
 
Number
Exercisable
(Shares)
 
Weighted Average
Exercise Price per
Share
$
9.56 to 10.00
 
4,882

 
0.8
 
$
9.56

 
4,882

 
$
9.56

 
10.01 to 20.00
 
13,179,570

 
4.5
 
15.32

 
9,619,657

 
15.43

 
20.01 to 30.00
 
34,637,310

 
4.8
 
24.86

 
27,154,258

 
25.33

 
30.01 to 38.40
 
51,817,336

 
4.9
 
32.81

 
31,755,628

 
32.59

$
9.56 to 38.40
 
99,639,098

 
4.8
 
$
27.73

 
68,534,425

 
$
27.30