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Retirement Plans (Details 3) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 29, 2012
Dec. 31, 2011
Jan. 01, 2011
Pension Benefits
     
Change in benefit obligation      
Benefit obligation at beginning of year $ 6,325 $ 5,877  
Service cost 119 129 124
Interest cost 305 327 328
Amendments   7  
Actuarial losses (gains) 644 331  
Benefits paid (360) (339)  
Foreign exchange rate changes 29 (7)  
Other (9)    
Benefit obligation at end of year 7,053 6,325 5,877
Change in fair value of plan assets      
Balance at beginning of year 5,013 4,559  
Actual return on plan assets 649 167  
Employer contributions 389 628  
Benefits paid (360) (339)  
Foreign exchange rate changes 24 (3)  
Settlements and disbursements   1  
Balance at end of year 5,715 5,013 4,559
Funded status at end of year (1,338) (1,312)  
Postretirement Benefits Other than Pensions
     
Change in benefit obligation      
Benefit obligation at beginning of year 561 614  
Service cost 6 8 8
Interest cost 25 33 34
Amendments (2) (23)  
Plan participants' contributions 5 5  
Actuarial losses (gains) 15 (17)  
Benefits paid (52) (59)  
Other 6    
Benefit obligation at end of year 564 561 614
Change in fair value of plan assets      
Funded status at end of year $ (564) $ (561)