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Derivative Financial Instruments (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2012
Derivative [Line Items]  
Cash flow hedge gains to be reclassified during the next 12 months, pre-tax $ 61
Fair value of foreign exchange and commodity contracts that have credit-risk-related contingent features that are in a net liability position $ (10)
Foreign Exchange Contracts [Member]
 
Derivative [Line Items]  
Derivative, Maturity Date Dec. 31, 2021
Commodity Contracts [Member]
 
Derivative [Line Items]  
Derivative, Maturity Date Dec. 31, 2016