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Stock Compensation (Tables)
9 Months Ended
Sep. 29, 2012
Stock Compensation [Abstract]  
Schedule of Compensation Expense for Equity Programs and Related Tax Benefits [Table Text Block]
         
  Quarter ended  Year-to-date period ended
(millions) September 29, 2012  October 1, 2011  September 29, 2012  October 1, 2011
Pre-tax compensation expense $ 10 $8 $ 32 $30
Related income tax benefit $ 4 $3 $ 12 $11
Summary of Share-based Compensation [Table Text Block]
Year-to-date period ended September 29, 2012:       
     Weighted-   
    Weighted-average  Aggregate
    averageremaining  intrinsic
 Shares  exercisecontractual  value
Employee and director stock options(millions)  priceterm (yrs.)  (millions)
Outstanding, beginning of period 24 $ 48    
Granted 6   52    
Exercised (2)   43    
Forfeitures and expirations (1)   53    
Outstanding, end of period 27 $ 496.4 $78
Exercisable, end of period 17 $ 485.1 $78

Year-to-date period ended October 1, 2011:       
     Weighted-   
    Weighted-average  Aggregate
    averageremaining  intrinsic
 Shares  exercisecontractual  value
Employee and director stock options(millions)  priceterm (yrs.)  (millions)
Outstanding, beginning of period 26 $ 47    
Granted 5   53    
Exercised (6)   45    
Forfeitures and expirations (1)   52    
Outstanding, end of period 24 $ 486.5 $121
Exercisable, end of period 16 $ 465.2 $108
Schedule of Stock Option Valuation Model Assumptions for Grants [Table Text Block]
   Weighted-average expected volatilityWeighted-average expected term (years)Weighted-average risk-free interest rateDividend yield
Grants within the year-to-date      
period ended September 29, 2012:  16%7.531.60%3.30%
Grants within the year-to-date      
period ended October 1, 2011:  17%6.983.07%3.10%
Maximum Future Value of Performance Shares [Table Text Block]
(millions) September 29, 2012 
2010 Award$20 
2011 Award$21 
2012 Award$24 
    
The 2009 performance share award, payable in stock, was settled at 82% of target in February 2012 for a total dollar
equivalent of $7 million.