Fair Value Of Financial Instruments (Schedule Of Carrying And Fair Values Of Other Financial Assets And Liabilities) (Details) (USD $) In Millions, unless otherwise specified	Apr. 01, 2012		Dec. 31, 2011
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, including current portion	$ (3,908)		$ (3,930)
Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale	70	[1]	70	[1]
Held-to-maturity	299	[1]	178	[1]
Other investments	148	[1]	145	[1]
Derivatives	65	[1]	34	[1]
Long-term debt, including current portion	(3,908)	[1]	(3,930)	[1]
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale	70	[1]	70	[1]
Held-to-maturity	299	[1]	175	[1]
Other investments	148	[1]	145	[1]
Derivatives	65	[1]	34	[1]
Long-term debt, including current portion	(4,153)	[1]	(4,199)	[1]
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale	14	[1]	8	[1]
Other investments	86	[1]	89	[1]
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale	56	[1],[2]	62	[1],[2]
Held-to-maturity	299	[1],[2]	175	[1],[2]
Other investments	62	[1],[2]	56	[1],[2]
Derivatives	65	[1],[2]	34	[1],[2]
Long-term debt, including current portion	$ (4,153)	[1],[2]	$ (4,199)	[1],[2]

[1] We had no Level 3 financial instruments on December 31, 2011, or April 1, 2012.

[2] Determined under a market approach using valuation models that incorporate observable inputs such as interest rates, bond yields and quoted prices for similar assets and liabilities.