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Stock Compensation (Tables)
6 Months Ended
Jun. 29, 2013
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) June 29, 2013  June 30, 2012  June 29, 2013  June 30, 2012
Pre-tax compensation expense $ 12 $10 $ 21 $22
Related income tax benefit $ 5 $4 $ 8 $8
Summary of Share-based Compensation [Table Text Block]
Year-to-date period ended June 29, 2013:       
     Weighted-   
    Weighted-average  Aggregate
    averageremaining  intrinsic
 Shares  exercisecontractual  value
Employee and director stock options(millions)  priceterm (yrs.)  (millions)
Outstanding, beginning of period 25 $ 50    
Granted 6   60    
Exercised (9)   48    
Forfeitures and expirations (1)   54    
Outstanding, end of period 21 $ 537.4 $231
Exercisable, end of period 10 $ 505.8 $150

Year-to-date period ended June 30, 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   53    
Exercised (1)   42    
Forfeitures and expirations (1)   53    
Outstanding, end of period 28 $ 496.6 $58
Exercisable, end of period 18 $ 475.3 $58
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 June 29, 2013:  15%7.441.49%2.90%
Grants within the year-to-date period ended June 30, 2012:  16%7.531.60%3.30%
Maximum Future Value of Performance Shares [Table Text Block]
(millions) June 29, 2013 
2011 Award$15 
2012 Award$26 
2013 Award$29 
    
The 2010 performance share award, payable in stock, was settled at 40% of target in February 2013 for a total dollar
equivalent of $4 million.