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Derivative Instruments (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Derivatives and Hedges    
Forward exchange and option agreements in various currencies $ 900 $ 640
Foreign exchange contracts gain (loss) recognized in income (3) 1
Commodity futures contracts | Cash Flow Hedges
   
Derivatives and Hedges    
Coverage of commodity futures contracts (in MM BTUs) 6,200,000 4,600,000
Unrecognized gain (loss) included in Accumulated OCI 2 (6)
Commodity futures contracts gain (loss) recognized in OCI 3 (3)
Commodity futures contracts gain (loss) reclassified from accumulated OCI into income $ (1) $ (3)
Commodity futures contracts | Cash Flow Hedges | Minimum
   
Derivatives and Hedges    
Period during which unrecognized loss included in Accumulated OCI will be reclassified into earnings 12 months  
Commodity futures contracts | Cash Flow Hedges | Maximum
   
Derivatives and Hedges    
Period during which unrecognized loss included in Accumulated OCI will be reclassified into earnings 24 months