Hedging Activities (Notional Amounts And Fair Values Of Derivative Financial Instruments) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Derivatives Fair Value [Line Items]
Total derivatives - Notional amount	$ 3,996	$ 3,548
Total derivative assets - Fair value	12	5
Total derivative liabilities - Fair value	(169)	(200)
Foreign Exchange Contracts [Member]
Derivatives Fair Value [Line Items]
Derivatives designated as hedging instruments - Notional amount	402	602
Derivatives not designated as hedging instruments - Notional amount	3,094	2,946
Benchmark Interest Rate [Member]
Derivatives Fair Value [Line Items]
Derivatives designated as hedging instruments - Notional amount	500
Other Current Assets [Member] | Foreign Exchange Contracts [Member]
Derivatives Fair Value [Line Items]
Derivative assets not designated as hedging instruments - Fair value	6	1
Designated As Hedging Instrument [Member] | Other Current Assets [Member] | Foreign Exchange Contracts [Member]
Derivatives Fair Value [Line Items]
Total derivative assets - Fair value	6	4
Designated As Hedging Instrument [Member] | Other Accrued Liabilities [Member] | Foreign Exchange Contracts [Member]
Derivatives Fair Value [Line Items]
Total derivative liabilities - Fair value	(8)	(33)
Designated As Hedging Instrument [Member] | Other Accrued Liabilities [Member] | Benchmark Interest Rate [Member]
Derivatives Fair Value [Line Items]
Total derivative liabilities - Fair value	(33)
Derivatives Not Designated As Hedging Instruments [Member] | Other Accrued Liabilities [Member] | Foreign Exchange Contracts [Member]
Derivatives Fair Value [Line Items]
Total derivative liabilities - Fair value	(122)	(122)
Derivatives Not Designated As Hedging Instruments [Member] | Other Liabilities [Member]
Derivatives Fair Value [Line Items]
Total derivative liabilities - Fair value	$ (6)	$ (45)