Employee Benefits (Contributions to Employee Benefit Plans) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 29, 2012	Oct. 01, 2011	Sep. 29, 2012	Oct. 01, 2011	Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Employer contributions to employee benefit plans	$ 10	$ 4	$ 43	$ 187	$ 192
Total current year projected employer contributions	54		54
Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions to employee benefit plans	7	1	31	176	180
Total current year projected employer contributions	37		37
Nonpension Postretirement [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions to employee benefit plans	3	3	12	11	12
Total current year projected employer contributions	$ 17		$ 17