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Derivative Financial Instruments (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Jun. 30, 2012
Derivative [Line Items]  
Cash flow hedge gains to be reclassified during the next 12 months, pre-tax $ 28
Fair value of foreign exchange and commodity contracts that have credit-risk-related contingent features that are in a net liability position $ 11
Five-Year Credit Facility [Member]
 
Derivative [Line Items]  
Expiration date of credit facility November 2016
Foreign Exchange Contracts [Member]
 
Derivative [Line Items]  
Maximum year of hedging contracts 2021
Commodity Contracts [Member]
 
Derivative [Line Items]  
Maximum year of hedging contracts 2016