Retirement Plans (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Apr. 02, 2011
Pension Benefits [Member]
Net periodic benefit cost
Service cost	$ 30	$ 32
Interest cost	76	82
Expected return on plan assets	(101)	(98)
Amortization of prior service cost (credit)	4	4
Amortization of net loss	29	19
Net periodic benefit cost	38	39
Postretirement Benefits Other than Pensions [Member]
Net periodic benefit cost
Service cost	2	2
Interest cost	6	8
Expected return on plan assets
Amortization of prior service cost (credit)	(3)	(1)
Amortization of net loss	2	3
Net periodic benefit cost	$ 7	$ 12