Stock Compensation (Tables)

12 Months Ended

Dec. 31, 2011

Stock Compensation [Abstract]

Schedule of Compensation Expense for Equity Programs and Related Tax Benefits [Table Text Block]

(millions)		2011		2010		2009
Pre-tax compensation expense	$	37	$	29	$	48
Related income tax benefit	$	13	$	10	$	17

Schedule of cash and tax benefits received upon exercise of stock options and similiar instruments [Table Text Block]

(millions)		2011		2010		2009
Total cash received from option exercises and similar instruments	$	291	$	204	$	131
Tax benefits realized upon exercise or vesting of stock-based awards:
Windfall benefits classified as financing cash flow		11		8		4
Other amounts classified as operating cash flow		25		20		12
Total	$	36	$	28	$	16

Schedule of stock option valuation model assumptions for grants [Table Text Block]

Stock option valuation model assumptions			2011			2010			2009
for grants within the year ended:
	Weighted-average expected volatility		17.00	%		20.00	%		24.00	%
	Weighted-average expected term (years)		6.99			4.94			5.00
	Weighted-average risk-free interest rate		3.06	%		2.54	%		2.10	%
	Dividend yield		3.10	%		2.80	%		3.40	%
Weighted-average fair value of options granted		$	7.59		$	7.90		$	6.33

Summary of Share-based Compensation [Table Text Block]

				Weighted-
			Weighted-	average		Aggregate
			average	remaining		intrinsic
	Shares		exercise	contractual		value
Employee and director stock options	(millions)		price	term (yrs.)		(millions)
Outstanding, beginning of period	26	$	47
Granted	5		53
Exercised	(6)		45
Forfeitures and expirations	(1)		52
Outstanding, end of period	24	$	48	6.2	$	80
Exercisable, end of period	16	$	47	5.0	$	69

Additionally, option activity for the comparable prior year periods is presented in the following table:
(millions, except per share data)		2010		2009
Outstanding, beginning of year		26		26
Granted		4		4
Exercised		(4)		(3)
Forfeitures and expirations		-		(1)
Outstanding, end of year		26		26
Exercisable, end of year		20		22
Weighted-average exercise price:
Outstanding, beginning of year	$	45	$	45
Granted		53		40
Exercised		43		41
Forfeitures and expirations		-		48
Outstanding, end of year	$	47	$	45
Exercisable, end of year	$	46	$	45

Summary of restricted stock activity [Table Text Block]

			Weighted- average
Employee restricted stock	Shares		grant-date
and restricted stock units	(thousands)		fair value
Non-vested, beginning of year	304	$	49
Granted	102		51
Vested	(145)		47
Forfeited	(5)		47
Non-vested, end of year	256	$	50