Stock Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2010

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Assumptions relating to valuation of stock options

	2010			2009			2008
Dividend yield		2.9	%		3.6	%		1.8	%
Volatility rate		25	%		25	%		20	%
Risk-free interest rate		2.2	%		1.7	%		2.8	%
Expected option life (years)		6			5-6			6

Stock Option Plan [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Rollforward Activity

	Shares			Weighted-		Weighted-Average		Aggregate
	Under Option			Average		Remaining		Intrinsic Value
	(in thousands)			Exercise Price		Contractual Term		($ in millions)
Outstanding at January 1, 2010		14,442		$	53		3.8 years	$	88
Granted		2,092			60
Exercised		(2,913	)		48
Cancelled and forfeited		(400	)		54
Outstanding at December 31, 2010		13,221		$	55		3.8 years	$	149
Vested and expected to vest in the future at December 31, 2010		13,084		$	55		3.7 years	$	147
Exercisable at December 31, 2010		9,813		$	55		3.1 years	$	115
Available for grant at December 31, 2010		7,257

Stock Awards Plan [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Rollforward Activity

	Stock			Weighted-Average		Weighted-Average
	Awards			Grant Date		Remaining
	(in thousands)			Fair Value		Contractual Term
Outstanding at January 1, 2008		5,144		$	67		1.3 years
Granted		1,505			80
Vested		(2,950	)		64
Forfeited		(423	)		65
Outstanding at December 31, 2008		3,276		$	75		1.4 years
Granted		2,356			45
Vested		(1,645	)		71
Forfeited		(329	)		66
Outstanding at December 31, 2009		3,658		$	58		1.6 years
Granted		2,317			60
Vested		(1,319	)		79
Forfeited		(356	)		56
Outstanding at December 31, 2010		4,300		$	53		1.5 years
Available for grant at December 31, 2010		2,110