Derivative Instruments and Fair Value Measurements (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Derivatives, Fair Value [Line Items]
Assets	$ 28	$ 36
Liabilities	(63)	(68)
Level 1 [Member]
Derivatives, Fair Value [Line Items]
Assets	0	2
Liabilities	(3)	(4)
Level 2 [Member]
Derivatives, Fair Value [Line Items]
Assets	28	34
Liabilities	(60)	(64)
Foreign Currency Exchange Contracts [Member] | Other Prepaid Assets [Member]
Derivatives, Fair Value [Line Items]
Assets	7	11
Foreign Currency Exchange Contracts [Member] | Other Prepaid Assets [Member] | Level 1 [Member]
Derivatives, Fair Value [Line Items]
Assets	0	0
Foreign Currency Exchange Contracts [Member] | Other Prepaid Assets [Member] | Level 2 [Member]
Derivatives, Fair Value [Line Items]
Assets	7	11
Foreign Currency Exchange Contracts [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Liabilities	(3)	(18)
Foreign Currency Exchange Contracts [Member] | Other Current Liabilities [Member] | Level 1 [Member]
Derivatives, Fair Value [Line Items]
Liabilities	0	0
Foreign Currency Exchange Contracts [Member] | Other Current Liabilities [Member] | Level 2 [Member]
Derivatives, Fair Value [Line Items]
Liabilities	(3)	(18)
Interest Rate Contracts [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Assets	21	23
Interest Rate Contracts [Member] | Other Assets [Member] | Level 1 [Member]
Derivatives, Fair Value [Line Items]
Assets	0	0
Interest Rate Contracts [Member] | Other Assets [Member] | Level 2 [Member]
Derivatives, Fair Value [Line Items]
Assets	21	23
Interest Rate Contracts [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Liabilities	(9)	0
Interest Rate Contracts [Member] | Other Liabilities [Member] | Level 1 [Member]
Derivatives, Fair Value [Line Items]
Liabilities	0	0
Interest Rate Contracts [Member] | Other Liabilities [Member] | Level 2 [Member]
Derivatives, Fair Value [Line Items]
Liabilities	(9)	0
Commodity Contracts [Member] | Other Prepaid Assets [Member]
Derivatives, Fair Value [Line Items]
Assets	0	2
Commodity Contracts [Member] | Other Prepaid Assets [Member] | Level 1 [Member]
Derivatives, Fair Value [Line Items]
Assets	0	2
Commodity Contracts [Member] | Other Prepaid Assets [Member] | Level 2 [Member]
Derivatives, Fair Value [Line Items]
Assets	0	0
Commodity Contracts [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Liabilities	(16)	(16)
Commodity Contracts [Member] | Other Current Liabilities [Member] | Level 1 [Member]
Derivatives, Fair Value [Line Items]
Liabilities	(3)	(4)
Commodity Contracts [Member] | Other Current Liabilities [Member] | Level 2 [Member]
Derivatives, Fair Value [Line Items]
Liabilities	(13)	(12)
Commodity Contracts [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Liabilities	(35)	(34)
Commodity Contracts [Member] | Other Liabilities [Member] | Level 1 [Member]
Derivatives, Fair Value [Line Items]
Liabilities	0	0
Commodity Contracts [Member] | Other Liabilities [Member] | Level 2 [Member]
Derivatives, Fair Value [Line Items]
Liabilities	$ (35)	$ (34)