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Financial Instruments - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2014
Commodity contracts
Jun. 30, 2014
Currency exchange contracts
Jun. 30, 2014
Interest rate contracts
Jun. 30, 2014
Cash Flow Hedges
Commodity contracts
Jun. 30, 2014
Cash Flow Hedges
Currency exchange contracts
Jun. 30, 2014
Cash Flow Hedges
Interest rate contracts
Maximum
Jun. 30, 2014
Exchange Traded Options
Dec. 31, 2013
Exchange Traded Options
Jun. 30, 2014
Exchange Traded Options
Other Current Assets
Dec. 31, 2013
Exchange Traded Options
Other Current Assets
Derivative Instruments, Gain (Loss) [Line Items]                        
Margin deposits related to exchange traded derivatives                     $ 26 $ 22
Derivative asset amounts that could be net settled 176 349             27 7    
Derivative liability amounts that could be net settled 77 47                    
Expected transfers of unrealized gains (losses) to earnings, within next 12 months           $ (6) $ 4 $ (1)        
Hedged forecasted transactions     9 months 18 months 31 years 8 months