Employee Benefits (Components of Company Plan Benefit Expense) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 27, 2014	Sep. 28, 2013	Sep. 27, 2014	Sep. 28, 2013
Defined Benefit Plan Disclosure [Line Items]
Recognized net loss	$ (7)
Curtailment	12
Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	27	33	80	101
Interest cost	56	51	169	151
Expected return on plan assets	(104)	(90)	(313)	(269)
Amortization of unrecognized prior service cost	3	4	10	12
Total expense	(18)	(2)	(54)	(5)
Other Nonpension Postretirement [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	7	8	21	25
Interest cost	13	13	40	37
Expected return on plan assets	(24)	(21)	(73)	(65)
Amortization of unrecognized prior service cost	(1)	0	(2)	(2)
Recognized net loss	7		7
Curtailment	(12)		(12)
Total expense	(10)	0	(19)	(5)
Postemployment [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	2	2	6	5
Interest cost	1	1	3	3
Recognized net loss	1	1	3	4
Total expense	$ 4	$ 4	$ 12	$ 12