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Financial Instruments (Notional Amounts of Derivatives) (Details) (USD $) In Millions, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
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Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] |  |
Derivative [Line Items] |  |
Derivative notional amounts | $ 1,000 | $ 1,000
Designated as Hedging Instrument [Member] | Foreign Currency Contract [Member] |  |
Derivative [Line Items] |  |
Derivative notional amounts | 683 | 1,083
Designated as Hedging Instrument [Member] | Commodity Contract [Member] |  |
Derivative [Line Items] |  |
Derivative notional amounts | 168 | 753
Not Designated as Hedging Instrument [Member] | Foreign Currency Contract [Member] |  |
Derivative [Line Items] |  |
Derivative notional amounts | 11,611 | 6,733
Not Designated as Hedging Instrument [Member] | Commodity Contract [Member] |  |
Derivative [Line Items] |  |
Derivative notional amounts | $ 15 | $ 242

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
Name: | invest_DerivativeNotionalAmount
Namespace Prefix: | invest_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_DerivativeLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration