Derivatives (Details 5) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012 CounterParties	Dec. 31, 2011
Location and Fair Value Amount of Derivative Instruments
Fair Value of Derivative Instruments, Assets	$ 79	$ 135
Fair Value of Derivative Instruments, Liabilities	54	49
Year-on-year currency effects impact on net income (loss), including hedging impact	(26)
Year-on-year derivative and other transaction gains and (losses) impact	(7)
Primary derivative counterparties	2
Derivatives designated as hedging instruments
Location and Fair Value Amount of Derivative Instruments
Fair Value of Derivative Instruments, Assets	61	110
Fair Value of Derivative Instruments, Liabilities	43	41
Derivatives designated as hedging instruments | Foreign currency forward/option contracts | Other current assets
Location and Fair Value Amount of Derivative Instruments
Fair Value of Derivative Instruments, Assets	34	82
Derivatives designated as hedging instruments | Foreign currency forward/option contracts | Other current liabilities
Location and Fair Value Amount of Derivative Instruments
Fair Value of Derivative Instruments, Liabilities	36	34
Derivatives designated as hedging instruments | Commodity price swap contracts | Other current liabilities
Location and Fair Value Amount of Derivative Instruments
Fair Value of Derivative Instruments, Liabilities	7	7
Derivatives designated as hedging instruments | Interest rate swap contracts | Other assets
Location and Fair Value Amount of Derivative Instruments
Fair Value of Derivative Instruments, Assets	27	28
Derivatives not designated as hedging instruments
Location and Fair Value Amount of Derivative Instruments
Fair Value of Derivative Instruments, Assets	18	25
Fair Value of Derivative Instruments, Liabilities	11	8
Derivatives not designated as hedging instruments | Foreign currency forward/option contracts | Other current assets
Location and Fair Value Amount of Derivative Instruments
Fair Value of Derivative Instruments, Assets	18	25
Derivatives not designated as hedging instruments | Foreign currency forward/option contracts | Other current liabilities
Location and Fair Value Amount of Derivative Instruments
Fair Value of Derivative Instruments, Liabilities	$ 11	$ 8