Reorganization Of Businesses (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 30, 2013	Mar. 31, 2012	Dec. 31, 2012
Restructuring Cost and Reserve [Line Items]
Reorganization of business charges	$ 11	$ 9
Restructuring Charges	16
Reversals for accruals no longer needed	(5)
Restructuring Reserve	31		35
Number of Employees Impacted By Reorganization of Business
Restructuring charges settled with cash	15
Employee Separation Costs [Member]
Restructuring Cost and Reserve [Line Items]
Reorganization of business charges		12
Restructuring Charges	16
Reversals for accruals no longer needed	(5)
Restructuring Reserve	27		31
Number of Employees Impacted By Reorganization of Business
Accrual for employee severance, initial payment in current year (in number of employees)	200
Restructuring charges in the period for total employee severance (in number of employees)	200
Restructuring charges in the period for indirect employees' severance (in number of employees)	100	200
Restructuring charges in the period for direct employees' severance (in number of employees)	100
Restructuring charges settled with cash	15
Number of employees expected to be paid (in number of employees)	600
Building Impairment [Member]
Restructuring Cost and Reserve [Line Items]
Reorganization of business charges		1
Restructuring Reversal [Member]
Restructuring Cost and Reserve [Line Items]
Reversals for accruals no longer needed	(5)
Number of Employees Impacted By Reorganization of Business
Restructuring reversals no longer needed		(4)
Exit Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	0
Reversals for accruals no longer needed	0
Restructuring Reserve	4		4
Number of Employees Impacted By Reorganization of Business
Restructuring charges settled with cash	$ 0