Reorganization Of Businesses (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012 employee	Dec. 31, 2011 employee	Dec. 31, 2010 employee	Dec. 31, 2009 employee
Restructuring Cost and Reserve [Line Items]
Reorganization of business charges	$ 50	$ 58	$ 73
Additional charges	54	60	89
Restructuring Reserve	35	44	67	47
Cash Payments made towards exit costs	(55)	(81)	(53)
Number of Employees Impacted By Reorganization of Business
Accrual for employee severance, initial payment in current year (in number of employees)	700
Restructuring charges in the period for total employee severance (in number of employees)	1,000
Restructuring charges in the period for indirect employees' severance (in number of employees)	700	900
Restructuring charges in the period for direct employees' severance (in number of employees)	300
Number of employees expected to be paid (in number of employees)	700
Number of employees separated			1,000
Number of direct employees separated			700
Number of indirect employees separated			300
Reversals for accruals no longer needed	(8)	(2)	(16)
Cost Of Sales
Restructuring Cost and Reserve [Line Items]
Reorganization of business charges	9	6	19
Other Charges [Member]
Restructuring Cost and Reserve [Line Items]
Reorganization of business charges	41	52	54
Exit Costs
Restructuring Cost and Reserve [Line Items]
Reorganization of business charges	1	19	16
Reversals of accruals no longer needed	2
Other restructuring adjustments	3
Additional charges	0	19	16
Restructuring Reserve	4	14	17	16
Cash Payments made towards exit costs	(11)	(23)	(12)
Number of Employees Impacted By Reorganization of Business
Reversals for accruals no longer needed	1	1	(3)
Employee Separation Costs
Restructuring Cost and Reserve [Line Items]
Reorganization of business charges		41	73
Reversals of accruals no longer needed		(2)
Additional charges	54	41	73
Restructuring Reserve	31	30	50	31
Cash Payments made towards exit costs	(44)	(58)	(41)
Number of Employees Impacted By Reorganization of Business
Restructuring charges in the period for total employee severance (in number of employees)	1,000	1,000
Restructuring charges in the period for indirect employees' severance (in number of employees)	700	600
Restructuring charges in the period for direct employees' severance (in number of employees)	300	300
Number of employees separated		1,300	1,600	1,400
Number of direct employees separated		800	800
Number of indirect employees separated		500	800
Reversals for accruals no longer needed	(9)	(3)	(13)
Building Impairment
Restructuring Cost and Reserve [Line Items]
Reorganization of business charges	7
Restructuring Reversal
Restructuring Cost and Reserve [Line Items]
Reorganization of business charges			16
Number of Employees Impacted By Reorganization of Business
Reversals for accruals no longer needed	$ (11)