Retirement Plans (Details 2) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Jan. 01, 2011	Jan. 02, 2010
Pension Benefits [Member]
Change in benefit obligation
Benefit obligation at beginning of year	$ 5,877	$ 5,470
Service cost	129	124	116
Interest cost	327	328	323
Amendments	7	5
Actuarial losses (gains)	331	292
Benefits paid	(339)	(330)
Foreign exchange rate changes	(7)	(10)
Curtailments		(2)
Benefit obligation at end of year	6,325	5,877	5,470
Change in fair value of plan assets
Balance at beginning of year	4,559	4,005
Actual return on plan assets	167	505
Employer contributions	628	390
Benefits paid	(339)	(330)
Foreign exchange rate changes	(3)	(9)
Settlements and disbursements	1	(2)
Balance at end of year	5,013	4,559	4,005
Funded status at end of year	(1,312)	(1,318)
Postretirement Benefits Other than Pensions [Member]
Change in benefit obligation
Benefit obligation at beginning of year	614	646
Service cost	8	8	8
Interest cost	33	34	38
Amendments	(23)	(16)
Plan participants' contributions	5	5
Actuarial losses (gains)	(17)
Benefits paid	(59)	(63)
Benefit obligation at end of year	561	614	646
Change in fair value of plan assets
Balance at beginning of year	0	0
Balance at end of year	0	0	0
Funded status at end of year	$ (561)	$ (614)