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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Parenthetical) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)    
Unrealized gains (losses) on foreign exchange contracts designated as cash flow or net investment hedges, tax (expense) benefit $ (1) $ (4)
Unrealized gains (losses) on investments, tax (expense) benefit   (7)
Reclassification of realized net losses (gains) to net income, tax expense (benefit) 2  
Pension adjustment, tax (expense) benefit