Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2011

Information regarding stock-based compensation appears in the table below:

	Three Months Ended				Six Months Ended
	June 30,				June 30,
Millions	2011		2010		2011		2010
Stock-based compensation, before tax:
Stock options	$	4	$	5	$	9	$	9
Retention awards		17		16		34		29
Total stock-based compensation, before tax	$	21	$	21	$	43	$	38
Excess tax benefits from equity compensation plans	$	29	$	2	$	67	$	11

The table below shows the year-to-date weighted-average assumptions used for valuation purposes:

Weighted-Average Assumptions		2011		2010
Risk-free interest rate		2.3%		2.4%
Dividend yield		1.6%		1.8%
Expected life (years)		5.3		5.4
Volatility		35.9%		35.2%
Weighted-average grant-date fair value of options granted	$	28.45	$	18.26

A summary of stock option activity during the six months ended June 30, 2011 is presented below:

	Shares (thous.)	Weighted-Average Exercise Price		Weighted-Average Remaining Contractual Term	Aggregate Intrinsic Value (millions)
Outstanding at January 1, 2011	9,815	$	44.77	5.2 yrs.	$	470
Granted	618		93.60	N/A		N/A
Exercised	(2,659)		37.98	N/A		N/A
Forfeited or expired	(40)		63.11	N/A		N/A
Outstanding at June 30, 2011	7,734	$	50.91	5.7 yrs.	$	414
Vested or expected to vest at June 30, 2011	7,645	$	50.71	5.7 yrs.	$	410
Options exercisable at June 30, 2011	6,077	$	46.12	4.9 yrs.	$	354

Additional information regarding stock option exercises appears in the table below:

	Three Months Ended				Six Months Ended
	June 30,				June 30,
Millions	2011		2010		2011		2010
Intrinsic value of stock options exercised	$	76	$	8	$	165	$	26
Cash received from option exercises		44		11		106		34
Treasury shares repurchased for employee payroll taxes		(16)		(2)		(41)		(8)
Tax benefit realized from option exercises		29		3		63		10
Aggregate grant-date fair value of stock options vested		1		-		19		19

Changes in our retention awards during the six months ended June 30, 2011 were as follows:

	Shares (thous.)	Weighted-Average Grant-Date Fair Value
Nonvested at January 1, 2011	2,638	$	54.01
Granted	528		93.68
Vested	(527)		48.58
Forfeited	(54)		57.46
Nonvested at June 30, 2011	2,585	$	63.15

The assumptions used to calculate the present value of estimated future dividends related to the February 2011 grant were as follows:

	2011
Dividend per share for the quarter	$	0.38
Risk-free interest rate at date of grant		1.2%

Changes in our performance retention awards during the six months ended June 30, 2011 were as follows:

	Shares (thous.)	Weighted-Average Grant-Date Fair Value
Nonvested at January 1, 2011	1,151	$	53.93
Granted	376		89.87
Vested	(194)		60.20
Forfeited	(116)		59.64
Nonvested at June 30, 2011	1,217	$	63.49