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Fair Value Measurements (Fair Value Of Assets And Liabilities) (Details) (USD $)
In Millions
Oct. 01, 2011
Dec. 31, 2010
Assets:  
Available-for-sale securities, fair value$ 167$ 172
Foreign exchange derivative contracts5[1]5[1]
Liabilities:  
Foreign exchange derivative contracts4[1]15[1]
Interest agreement derivative contracts3[1]3
U.S. Government And Agency Obligations [Member] | Sigma Fund Securities [Member]
  
Assets:  
Sigma Fund securities, fair value4,2452,291
U.S. Government And Agency Obligations [Member] | Sigma Fund Securities [Member] | Level 2 [Member]
  
Assets:  
Sigma Fund securities, fair value4,2452,291
Corporate Bonds [Member] | Sigma Fund Securities [Member]
  
Assets:  
Sigma Fund securities, fair value1958
Corporate Bonds [Member] | Sigma Fund Securities [Member] | Level 2 [Member]
  
Assets:  
Sigma Fund securities, fair value 43
Corporate Bonds [Member] | Sigma Fund Securities [Member] | Level 3 [Member]
  
Assets:  
Sigma Fund securities, fair value1915
Asset-Backed Securities [Member] | Sigma Fund Securities [Member]
  
Assets:  
Sigma Fund securities, fair value 1
Asset-Backed Securities [Member] | Sigma Fund Securities [Member] | Level 2 [Member]
  
Assets:  
Sigma Fund securities, fair value 1
Mortgage-Backed Securities [Member] | Sigma Fund Securities [Member]
  
Assets:  
Sigma Fund securities, fair value711
Mortgage-Backed Securities [Member] | Sigma Fund Securities [Member] | Level 2 [Member]
  
Assets:  
Sigma Fund securities, fair value711
U.S. Government And Agency Obligations [Member] | Available-For-Sale Securities [Member]
  
Assets:  
Available-for-sale securities, fair value1617
U.S. Government And Agency Obligations [Member] | Available-For-Sale Securities [Member] | Level 2 [Member]
  
Assets:  
Available-for-sale securities, fair value1617
Corporate Bonds [Member] | Available-For-Sale Securities [Member]
  
Assets:  
Available-for-sale securities, fair value1111
Corporate Bonds [Member] | Available-For-Sale Securities [Member] | Level 2 [Member]
  
Assets:  
Available-for-sale securities, fair value1111
Common Stock And Equivalents [Member] | Available-For-Sale Securities [Member]
  
Assets:  
Available-for-sale securities, fair value1412
Common Stock And Equivalents [Member] | Available-For-Sale Securities [Member] | Level 1 [Member]
  
Assets:  
Available-for-sale securities, fair value72
Common Stock And Equivalents [Member] | Available-For-Sale Securities [Member] | Level 2 [Member]
  
Assets:  
Available-for-sale securities, fair value710
Mortgage-Backed Securities [Member] | Available-For-Sale Securities [Member]
  
Assets:  
Available-for-sale securities, fair value33
Mortgage-Backed Securities [Member] | Available-For-Sale Securities [Member] | Level 2 [Member]
  
Assets:  
Available-for-sale securities, fair value33
Level 2 [Member]
  
Assets:  
Foreign exchange derivative contracts5[1]5[1]
Liabilities:  
Foreign exchange derivative contracts4[1]15[1]
Interest agreement derivative contracts$ 4[1]$ 3
[1]Includes amounts included in held for disposition.