Retirement Benefits (Net Periodic Pension Costs) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 30, 2013	Mar. 31, 2012
U.S. Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 0
Interest cost	88	88
Expected return on plan assets	(92)	(106)
Amortization of unrecognized net loss	33	68
Amortization of unrecognized prior service cost	0	0
Net periodic pension cost	29	50
Contributions	24
Non-U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	3	3
Interest cost	17	18
Expected return on plan assets	(19)	(19)
Amortization of unrecognized net loss	3	5
Amortization of unrecognized prior service cost	(2)	(1)
Net periodic pension cost	2	6
Contributions	$ 13