Financial Instruments (Summary Of Company's Derivative Instruments) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011
Designated Hedging Instruments [Member]
Derivative [Line Items]
Derivative liabilities	$ 3		$ 10
Non-Designated Hedging Instruments [Member]
Derivative [Line Items]
Derivative assets	3		29
Derivative liabilities	1		27
Other Non-Current Liabilities [Member] | Designated Hedging Instruments [Member] | Interest Rate Contracts [Member]
Derivative [Line Items]
Derivative liabilities	3		9
Other Non-Current Liabilities [Member] | Non-Designated Hedging Instruments [Member] | Interest Rate Contracts [Member]
Derivative [Line Items]
Derivative liabilities	0		1
Accrued Expenses And Other Current Liabilities [Member] | Designated Hedging Instruments [Member] | Foreign Exchange Contracts [Member]
Derivative [Line Items]
Derivative liabilities	0		1
Accrued Expenses And Other Current Liabilities [Member] | Non-Designated Hedging Instruments [Member] | Foreign Exchange Contracts [Member]
Derivative [Line Items]
Derivative liabilities	1		2
Other Non-Current Assets [Member] | Non-Designated Hedging Instruments [Member] | Interest Rate Contracts [Member]
Derivative [Line Items]
Derivative assets	2		4
Other Current Assets [Member] | Non-Designated Hedging Instruments [Member] | Foreign Exchange Contracts [Member]
Derivative [Line Items]
Derivative assets	1		1
Other Current Assets [Member] | Non-Designated Hedging Instruments [Member] | Call Options [Member]
Derivative [Line Items]
Derivative assets	0	[1]	24	[1]
Current Portion Of Long-Term Debt [Member] | Non-Designated Hedging Instruments [Member] | Bifurcated Conversion Feature [Member]
Derivative [Line Items]
Derivative liabilities	$ 0		$ 24

[1] (*) See Note 13 — Long-Term Debt and Borrowing Arrangements for further detail