Hedging Activities (Notional Amounts) (Details) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Derivatives, Fair Value
Total derivatives - Notional amount	$ 3,216	$ 3,548
Total derivative assets - Fair value	10	5
Total derivative liabilities - Fair Value	(195)	(200)
Designated As Hedging Instrument [Member] | Other Current Assets [Member]
Derivatives, Fair Value
Total derivative assets - Fair value	3	4
Designated As Hedging Instrument [Member] | Other Accrued Liabilities [Member]
Derivatives, Fair Value
Total derivative liabilities - Fair Value	(27)	(33)
Designated As Hedging Instrument [Member] | Other Liabilities [Member]
Derivatives, Fair Value
Total derivative liabilities - Fair Value	(2)
Designated As Hedging Instrument [Member] | Other Assets [Member]
Derivatives, Fair Value
Total derivative assets - Fair value	1
Not Designated As Hedging Instrument [Member] | Other Accrued Liabilities [Member]
Derivatives, Fair Value
Total derivative liabilities - Fair Value	(142)	(122)
Not Designated As Hedging Instrument [Member] | Other Liabilities [Member]
Derivatives, Fair Value
Total derivative liabilities - Fair Value	(24)	(45)
Other Current Assets [Member]
Derivatives, Fair Value
Derivative assets not designated as hedging instruments, Fair value	6	1
Foreign Exchange Contracts [Member]
Derivatives, Fair Value
Derivatives designated as hedging instruments - Notional amount	613	602
Derivatives not designated as hedging instruments - Notional amount	$ 2,603	$ 2,946