v2.4.0.6
Financial Instruments and Fair Value Measurements (Details 2) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Reconciliation of Assets and Liabilities Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3)    
Balance at beginning of period $ 571 $ 140
Purchases 2,270  
Sales (2,717)  
Issuances (129)  
Settlements (94)  
Purchases, issuances and settlements   (413)
Transfers into Level 3 573 65
Transfers out of Level 3 (150) (13)
Balance at end of period 281 571
Changes in unrealized gains and (losses) relating to assets and liabilities included in Cost of goods sold 106 660
Changes in unrealized gains and (losses) relating to assets and liabilities included in Foreign exchange gains (losses) (1) (1)
Cost of goods sold
    
Reconciliation of Assets and Liabilities Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3)    
Total gains and losses (realized/unrealized) included in income (42) 793
Foreign exchange gains (losses)
    
Reconciliation of Assets and Liabilities Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3)    
Total gains and losses (realized/unrealized) included in income (1) (1)
Derivatives, net
    
Reconciliation of Assets and Liabilities Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3)    
Balance at beginning of period 307 31
Purchases 108  
Sales 17  
Issuances (129)  
Settlements (94)  
Purchases, issuances and settlements   (156)
Transfers into Level 3 14 59
Transfers out of Level 3 (43) (11)
Balance at end of period (2) 307
Changes in unrealized gains and (losses) relating to assets and liabilities included in Cost of goods sold (6) 421
Changes in unrealized gains and (losses) relating to assets and liabilities included in Foreign exchange gains (losses) (1) (1)
Derivatives, net | Cost of goods sold
    
Reconciliation of Assets and Liabilities Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3)    
Total gains and losses (realized/unrealized) included in income (181) 385
Derivatives, net | Foreign exchange gains (losses)
    
Reconciliation of Assets and Liabilities Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3)    
Total gains and losses (realized/unrealized) included in income (1) (1)
Readily marketable inventories
    
Reconciliation of Assets and Liabilities Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3)    
Balance at beginning of period 264 109
Purchases 2,162  
Sales (2,734)  
Purchases, issuances and settlements   (257)
Transfers into Level 3 559 6
Transfers out of Level 3 (107) (2)
Balance at end of period 283 264
Changes in unrealized gains and (losses) relating to assets and liabilities included in Cost of goods sold 112 239
Readily marketable inventories | Cost of goods sold
    
Reconciliation of Assets and Liabilities Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3)    
Total gains and losses (realized/unrealized) included in income $ 139 $ 408