The 3M 2008 Long-Term Incentive Plan provides for the issuance or delivery of up to 100 million shares of 3M common stock (including additional shareholder approvals subsequent to 2008) pursuant to awards granted under the plan. Awards under this plan may be issued in the form of incentive stock options, nonqualified stock options, progressive stock options, stock appreciation rights, restricted stock, restricted stock units, other stock awards, and performance units and performance shares. Awards denominated in shares of common stock other than options and stock appreciation rights, per the 2008 Plan, count against the 100 million share limit as 3.38 shares for every one share covered by such award (for full value awards with grant dates prior to May 11, 2010), as 2.87 shares for every one share covered by such award (for full value awards with grant dates on or after May 11, 2010, and prior to May 8, 2012), or as 3.50 shares for every one share covered by such award (for full value awards with grant dates of May 8, 2012 or later). The remaining total shares available for grant under the 2008 Long Term Incentive Plan Program are 28,293,674 as of December 31, 2014. There were approximately 9,525 participants with outstanding options, restricted stock, or restricted stock units at December 31, 2014.

The Company's annual stock option and restricted stock unit grant is made in February to provide a strong and immediate link between the performance of individuals during the preceding year and the size of their annual stock compensation grants. The grant to eligible employees uses the closing stock price on the grant date. Accounting rules require recognition of expense under a non-substantive vesting period approach, requiring compensation expense recognition when an employee is eligible to retire. Employees are considered eligible to retire at age 55 and after having completed five years of service. This retiree-eligible population represents 33 percent of the 2014 annual stock-based compensation award expense dollars; therefore, higher stock-based compensation expense is recognized in the first quarter. 3M also has granted progressive (reload) options. These options are nonqualified stock options that were granted to certain participants under the 1997 or 2002 Management Stock Ownership Program, but for which the reload feature was eliminated in 2005 (on a prospective basis only).

In addition to the annual grants, the Company makes other minor grants of stock options, restricted stock units and other stock-based grants. The Company issues cash settled restricted stock units and stock appreciation rights in certain countries. These grants do not result in the issuance of common stock and are considered immaterial by the Company.

Amounts recognized in the financial statements with respect to stock-based compensation programs, which include stock options, restricted stock, restricted stock units, performance shares, and the General Employees' Stock Purchase Plan (GESPP), are provided in the following table. Capitalized stock-based compensation amounts were not material for the years ended 2014, 2013 and 2012.

Stock-Based Compensation Expense

	Years ended December 31
(Millions)	2014		2013		2012
Cost of sales	$	47	$	27	$	27
Selling, general and administrative expenses		192		183		167
Research, development and related expenses		41		30		29

Stock-based compensation expenses	$	280	$	240	$	223

Income tax benefits	$	(79)	$	(71)	$	(67)

Stock-based compensation expenses, net of tax	$	201	$	169	$	156

Stock Option Program

The following table summarizes stock option activity for the years ended December 31:
			2014			2013			2012
			Number of Options	Weighted Average Exercise Price		Number of Options	Weighted Average Exercise Price		Number of Options	Weighted Average Exercise Price



Under option —
	January 1		43,938,778	$	83.84	56,565,030	$	80.33	64,148,415	$	77.28
	Granted:
		Annual	5,736,183		126.77	6,220,810		101.55	5,770,190		87.91
		Progressive (Reload)	―		―	140,447		109.83	110,065		89.65
		Other	―		―	191		119.62	51,661		89.25
	Exercised		(10,219,261)		82.37	(18,825,218)		79.25	(13,123,617)		68.78
	Canceled		(220,143)		105.11	(162,482)		89.92	(391,684)		83.65
	December 31		39,235,557	$	90.38	43,938,778	$	83.84	56,565,030	$	80.33
Options exercisable
	December 31		27,502,208	$	81.42	32,038,228	$	79.58	45,207,143	$	78.78

Stock options vest over a period from one to three years with the expiration date at 10 years from date of grant. Outstanding options under grant include grants from previous plans. As of December 31, 2014, there was $59 million of compensation expense that has yet to be recognized related to non-vested stock option based awards. This expense is expected to be recognized over the remaining weighted-average vesting period of 21 months. For options outstanding at December 31, 2014, the weighted-average remaining contractual life was 65 months and the aggregate intrinsic value was $2.901 billion. For options exercisable at December 31, 2014, the weighted-average remaining contractual life was 50 months and the aggregate intrinsic value was $2.280 billion.

The total intrinsic values of stock options exercised during 2014, 2013 and 2012 was $615 million, $562 million and $282 million, respectively. Cash received from options exercised during 2014, 2013 and 2012 was $842 million, $1.492 billion and $903 million, respectively. The Company's actual tax benefits realized for the tax deductions related to the exercise of employee stock options for 2014, 2013 and 2012 was $226 million, $208 million and $98 million, respectively.

The Company does not have a specific policy to repurchase common shares to mitigate the dilutive impact of options; however, the Company has historically made adequate discretionary purchases, based on cash availability, market trends, and other factors, to satisfy stock option exercise activity.

For annual and progressive (reload) options, the weighted average fair value at the date of grant was calculated using the Black-Scholes option-pricing model and the assumptions that follow. As discussed earlier, the progressive (reload) feature was eliminated in 2005, resulting in no activity in the below table for 2014 and thereafter.

Stock Option Assumptions

	Annual									Progressive (Reload)
	2014			2013			2012			2014			2013			2012
Exercise price	$	126.72		$	101.49		$	87.89		$	―		$	109.84		$	87.89
Risk-free interest rate		1.9	%		1.2	%		1.1	%		―	%		0.2	%		0.2	%
Dividend yield		2.6	%		2.7	%		2.6	%		―	%		2.7	%		2.6	%
Volatility		20.8	%		20.0	%		24.5	%		―	%		16.3	%		23.4	%
Expected life (months)		75			75			74			―			12			19
Black-Scholes fair value	$	19.63		$	13.46		$	14.94		$	―		$	6.42		$	8.50

Expected volatility is a statistical measure of the amount by which a stock price is expected to fluctuate during a period. For the 2014 annual grant date, the Company estimated the expected volatility based upon the average of the most recent one year volatility, the median of the term of the expected life rolling volatility, the median of the most recent term of the expected life volatility of 3M stock, and the implied volatility on the grant date. The expected term assumption is based on the weighted average of historical grants.

Restricted Stock and Restricted Stock Units

The following table summarizes restricted stock and restricted stock unit activity for the years ended December 31:

				2014			2013			2012
					Weighted Average			Weighted Average			Weighted Average
				Number of	Grant Date		Number of	Grant Date		Number of	Grant Date
				Awards	Fair Value		Awards	Fair Value		Awards	Fair Value
Nonvested balance —
	As of January 1			3,105,361	$	92.31	3,261,562	$	85.17	4,858,972	$	73.02
		Granted
			Annual	798,615		126.79	946,774		101.57	968,522		87.92
			Other	78,252		152.74	44,401		111.19	99,337		85.07
		Vested		(1,100,675)		90.37	(1,100,095)		79.93	(2,594,468)		63.51
		Forfeited		(63,767)		97.23	(47,281)		90.82	(70,801)		82.65
	As of December 31			2,817,786	$	104.41	3,105,361	$	92.31	3,261,562	$	85.17

As of December 31, 2014, there was $84 million of compensation expense that has yet to be recognized related to non-vested restricted stock and restricted stock units. This expense is expected to be recognized over the remaining weighted-average vesting period of 26 months. The total fair value of restricted stock and restricted stock units that vested during the years ended December 31, 2014, 2013 and 2012 was $145 million, $114 million and $228 million, respectively. The Company's actual tax benefits realized for the tax deductions related to the vesting of restricted stock and restricted stock units for the years ended December 31, 2014, 2013 and 2012 was $54 million, $43 million and $86 million, respectively.

Restricted stock units granted under the 3M 2008 Long-Term Incentive Plan generally vest three years following the grant date assuming continued employment. Dividend equivalents equal to the dividends payable on the same number of shares of 3M common stock accrue on these restricted stock units during the vesting period, although no dividend equivalents are paid on any of these restricted stock units that are forfeited prior to the vesting date. Dividends are paid out in cash at the vest date on restricted stock units, except for performance shares which do not earn dividends. Since the rights to dividends are forfeitable, there is no impact on basic earnings per share calculations. Weighted average restricted stock unit shares outstanding are included in the computation of diluted earnings per share.

Instead of restricted stock units, the Company makes annual grants of performance shares to members of its executive management. The performance criteria for these performance shares (organic sales volume growth, return on invested capital and sales from new products) were selected because the Company believes that they are important drivers of long-term stockholder value. The number of shares of 3M common stock that could actually be delivered at the end of the three-year performance period may be anywhere from 0% to 200% of each performance share granted, depending on the performance of the Company during such performance period. Non-substantive vesting requires that expense for the performance shares be recognized over one or three years depending on when each individual became a 3M executive. The first performance shares, which were granted in 2008, were distributed in 2011. Performance shares do not accrue dividends during the performance period. Therefore, the grant date fair value is determined by reducing the closing stock price on the date of grant by the net present value of dividends during the performance period. As a result of the significant uncertainty due to the economic crisis of 2008-2009, the Company granted restricted stock units instead of performance shares in 2009. Therefore, since there were no performance shares in 2009, there were also no related distributions in 2012. Performance share grants resumed in 2010 and continued thereafter.

The following table summarizes performance share activity for the years ended December 31:

			2014			2013			2012
				Weighted Average			Weighted Average			Weighted Average
			Number of	Grant Date		Number of	Grant Date		Number of	Grant Date
			Awards	Fair Value		Awards	Fair Value		Awards	Fair Value
Undistributed balance —
	As of January 1		895,635	$	88.12	1,089,084	$	79.27	878,872	$	78.55
		Granted	305,225		124.89	353,734		96.87	467,531		81.55
		Distributed	(277,358)		84.74	(507,083)		75.16	―		―
		Performance change	212,461		109.74	(6,949)		77.01	(178,838)		81.27
		Forfeited	(36,212)		109.44	(33,151)		91.34	(78,481)		80.21
	As of December 31		1,099,752	$	102.65	895,635	$	88.12	1,089,084	$	79.27

As of December 31, 2014, there was $22 million of compensation expense that has yet to be recognized related to performance shares. This expense is expected to be recognized over the remaining weighted-average earnings period of 11 months. During the years ended December 31, 2014 and 2013, the total fair value of performance shares that were distributed were $35 million and $52 million, respectively. The Company's actual tax benefits realized for the tax deductions related to the distribution of performance shares for the years ended December 31, 2014 and 2013 was $11 million and $16 million, respectively. There were no performance shares distributed or related tax benefits realized during the year ended December 31, 2012.

As of December 31, 2014, shareholders have approved 60 million shares for issuance under the Company's GESPP. Substantially all employees are eligible to participate in the plan. Participants are granted options at 85% of market value at the date of grant. There are no GESPP shares under option at the beginning or end of each year because options are granted on the first business day and exercised on the last business day of the same month.

General Employees' Stock Purchase Plan

		2014			2013			2012
			Weighted			Weighted			Weighted
			Average			Average			Average
		Shares	Exercise Price		Shares	Exercise Price		Shares	Exercise Price

Options granted		1,073,956	$	118.73	1,259,247	$	93.46	1,455,545	$	75.32
Options exercised		(1,073,956)		118.73	(1,259,247)		93.46	(1,455,545)		75.32
Shares available for grant -
	December 31	29,112,004			30,185,960			31,445,207

The weighted-average fair value per option granted during 2014, 2013 and 2012 was $20.95, $16.49 and $13.29, respectively. The fair value of GESPP options was based on the 15% purchase price discount. The Company recognized compensation expense for GESSP options of $22 million in 2014, $21 million in 2013 and $19 million in 2012.