Retirement Plans (Schedule Of Net Periodic Cost Associated With Defined-Benefit Pension And Other Post-Retirement Benefit Plans) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Apr. 01, 2012	Apr. 03, 2011
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 71	$ 64
Interest cost	131	129
Expected return on plan assets	(147)	(150)
Recognized net actuarial loss	66	40
Amortization of prior service (credit) cost	(11)	(11)
Net periodic cost	110	72
Other Post-Retirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	3	4
Interest cost	14	15
Expected return on plan assets	(7)	(8)
Recognized net actuarial loss	2	1
Amortization of prior service (credit) cost	2	1
Net periodic cost	$ 14	$ 13