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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Parenthetical) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)        
Unrealized gains (losses) on commodity futures and foreign exchange contracts designated as cash flow hedges, tax (expense) benefit $ (10) $ 8 $ (2) $ 1
Unrealized gains (losses) on investments, tax (expense) benefit 1 3 (5)  
Reclassification of realized net losses (gains) to net income, tax expense (benefit) $ (11)   $ (11) $ 7