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Financial Instruments (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Impact of changes in fair values of derivatives
Derivative Instruments, Amount of Gain (Loss) Recorded into Income (Loss)	$ (15)	$ 15
Derivatives not designated as hedging instruments: [Member] \| Interest rate swaps [Member] \| Interest expense, net [Member]
Impact of changes in fair values of derivatives
Derivative Instruments, Amount of Gain (Loss) Recorded into Income (Loss)	(1)	1
Derivatives not designated as hedging instruments: [Member] \| Foreign currency contracts [Member] \| Selling, general and administrative [Member]
Impact of changes in fair values of derivatives
Derivative Instruments, Amount of Gain (Loss) Recorded into Income (Loss)	$ (14)	$ 14

The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

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