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Hedges and Derivative Financial Instruments (Schedule of Outstanding Derivative Contracts) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2013 | Dec. 31, 2012
Derivatives, Fair Value [Line Items] |  |
Derivative Assets, Current | $ 40 | $ 26
Derivative Assets, Noncurrent | 2 | 4
Total derivatives, hedge assets at fair value | 42 | 30
Derivative Liabilities, Current | 37 | 43
Derivative Liabilities, Noncurrent | 3 | 1
Total derivatives, hedge liabilities at fair value | 40 | 44
Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Notional amount of foreign exchange forwards/options | 861 | 1,101
Notional amount of commodity swaps/options | 343 | 354
Foreign exchange forward/options, hedge assets | 16 | 8
Foreign Exchange Forwards/Options, Hedge Liability at Fair Value | 5 | 12
Commodity Swaps/Options, Hedge Assets at Fair Value | 3 | 11
Commodity Swaps/Options, Hedge Liabilities at Fair Value | 16 | 9
Total derivatives accounted for as hedges, hedge assets at fair value | 19 | 19
Total derivatives accounted for as hedges, hedge liabilities at fair value | 21 | 21
Maximum term of foreign exchange forwards/options, in months | 15 | 18
Maximum term of commodity swaps/options, in months | 33 months | 24 months
Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Notional amount of foreign exchange forwards/options | 1,671 | 1,522
Notional amount of commodity swaps/options | 9 | 6
Foreign Exchange Forwards/Options, Hedge Assets at Fair Value | 23 | 11
Foreign Exchange Forwards/Options, Hedge Liabilities at Fair Value | 19 | 23
Commodity swaps/options, hedge assets at fair value | 0 | 0
Commodity Swaps/Options, hedge liabiilities at Fair Value | 0 | 0
Total derivatives not accounted for as hedges, hedge assets at fair value | 23 | 11
Total derivatives not accounted for as hedges, hedge liabilities at fair value | $ 19 | $ 23
Maximum term of foreign exchange forwards/options, in months | 17 | 13
Maximum term of commodity swaps/options, in months | 9 months | 12 months

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- Definition Maximum period the entity is hedging its exposure to the variability in future cash flows for forecasted transactions, excluding those forecasted transactions related to the payment of variable interest on existing financial instruments, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7668309&loc=d3e80748-113994 + Details
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- Definition Aggregate notional amount of foreign currency exchange rate derivatives. Notional amount refers to the number of currency units specified in the foreign currency derivative contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 + Details
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- Definition Fair value as of the balance sheet date of all price risk derivative assets not designated as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 17 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 + Details
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