Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2011

Stock-Based Compensation [Abstract]

Company's stock option activity and changes

	Number of Options			Weighted Average Exercise Price		Weighted Average Remaining Contractual Term		Aggregate Intrinsic Value
	(in thousands)					(in Years)		(in millions)
Number of shares under option
Outstanding at January 1, 2011		4,562.1		$	78.27		6.2	$	15
Options granted		694.8			80.17
Options exercised		(387.6	)		59.29
Options forfeited		(245.7	)		89.54
Outstanding at December 31, 2011		4,623.6		$	79.55		5.9	$	8
Vested and expected to vest at December 31, 2011 (1)		4,584.6		$	79.52		5.8	$	8
Exercisable at December 31, 2011		3,407.5		$	78.67		4.9	$	8

⁽¹⁾  Represents outstanding options reduced by expected forfeitures for options not fully vested.

Weighted average assumptions in valuation model

	2011 Grants			2010 Grants			2009 Grants
Expected holding period (in years)		5.2			4.7			4.6
Expected volatility		26.4	%		26.2	%		26.2	%
Expected dividend yield		2.8	%		2.2	%		2.4	%
Risk-free interest rate		2.2	%		2.3	%		2.5	%

	2011 Grants			2010 Grants
Expected volatility		25.0	%		27.9	%
Expected dividend yield		2.7	%		2.7	%
Risk-free interest rate		0.3	%		0.1	%

Company's nonvested restricted stock unit awards and changes

	Number of Shares			Weighted Average Grant Date Fair Value
	(in thousands)
Nonvested balance at January 1, 2011		1,733.7		$	85.41
Granted		688.0			80.17
Vested		(444.4	)		98.01
Forfeited		(153.0	)		80.86
Nonvested balance at December 31, 2011		1,824.3		$	80.74

Company's performance unit awards based on expected performance

	Payable in Cash (TSR)					Payable in Shares (EPS)
	Number of Units			Weighted Average Grant Date Fair Value		Number of Units			Weighted Average Grant Date Fair Value
	(in thousands)					(in thousands)
Outstanding at January 1, 2011		7.8		$	117.13		88.1		$	80.24
Granted		40.9			110.82		40.9			80.17
Increase due to expected performance		11.9			108.51		8.8			56.51
Vested		—			—		(69.3	)		73.61
Forfeited		(0.1	)		114.77		(2.1	)		77.40
Outstanding at December 31, 2011		60.5		$	111.19		66.4		$	84.07