Fair Value Measurements (Details) (USD $)
In Millions
Jul. 01, 2011
Level 1 inputs
Fair Value
Dec. 31, 2010
Level 1 inputs
Fair Value
Jul. 01, 2011
Level 1 inputs
Fair Value
Less than 1 year
Dec. 31, 2010
Level 1 inputs
Fair Value
Less than 1 year
Jul. 01, 2011
Level 1 inputs
Fair Value
1 - 2 years
Dec. 31, 2010
Level 1 inputs
Fair Value
1 - 2 years
Jul. 01, 2011
Level 1 inputs
Fair Value
1 - 2 years
Callable Bonds
Jun. 25, 2010
Level 1 inputs
Fair Value
1 - 2 years
Callable Bonds
Jul. 01, 2011
Level 1 inputs
Fair Value
2 - 5 years
Dec. 31, 2010
Level 1 inputs
Fair Value
2 - 5 years
Jul. 01, 2011
Level 1 inputs
Fair Value
2 - 5 years
Callable Bonds
Jun. 25, 2010
Level 1 inputs
Fair Value
2 - 5 years
Callable Bonds
Jul. 01, 2011
Level 1 inputs
Fair Value
Greater than 5 years
Dec. 31, 2010
Level 1 inputs
Fair Value
Greater than 5 years
Jul. 01, 2011
Level 1 inputs
Carrying Value
Dec. 31, 2010
Level 1 inputs
Carrying Value
Jul. 01, 2011
Level 2 inputs
Fair Value
Dec. 31, 2010
Level 2 inputs
Fair Value
Jul. 01, 2011
Level 2 inputs
Carrying Value
Dec. 31, 2010
Level 2 inputs
Carrying Value
Fair Value, by Balance Sheet Grouping                                        
Investments $ 151 $ 123 $ 30 $ 44 $ 59 [1] $ 45 [1] $ 5 $ 5 $ 62 [1] $ 31 [1] $ 5 $ 5 $ 0 $ 3 $ 150 $ 121        
Long-term Debt Including Current Maturities                                 $ 9,632 $ 9,624 $ 8,680 $ 8,664
[1] The 1-2 year category and the 2-5 year category include callable bonds of approximately $5 million for both 2011 and 2010, which are classified as short-term investments on the consolidated balance sheet.