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Derivative Instruments (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Derivatives and Hedges        
Foreign exchange contracts in various currencies $ 740 $ 590 $ 740 $ 590
Foreign exchange contracts gain (loss) recognized in income (9) 9 (12) 10
Commodity futures contracts | Cash Flow Hedges
       
Derivatives and Hedges        
Coverage of commodity futures contracts (in MM BTUs) 7,400,000 6,200,000 7,400,000 6,200,000
Unrecognized loss included in Accumulated OCI (1) (3) (1) (3)
Commodity futures contracts gain (loss) recognized in OCI (3) 1   (2)
Commodity futures contracts gain (loss) reclassified from accumulated OCI into income $ 1 $ (2)   $ (5)
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