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Receivables (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Receivables      
Accounts receivable $ 8,061 $ 8,366  
Commodity derivative and foreign currency contract receivables 136 174  
Notes receivable and other 26 214  
Receivables, gross 8,223 8,754  
Allowance for doubtful accounts (56) (48) (42)
Receivables, net 8,167 8,706  
Movement in valuation allowances and reserves rollforward      
Balance as of beginning of year 48 42 45
Increase in allowance charged to expense 21 21 14
Accounts charged against the allowance, net of recoveries (13) (14) (17)
Foreign currency translation 0 (1) 0
Balance as of end of year $ 56 $ 48 $ 42