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Condensed Consolidated Statements of Comprehensive Income (Parenthetical) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Condensed Consolidated Statements of Comprehensive Income    
Losses on cash flow hedges, income tax effect $ (4) $ (16)
Amount of (gains) losses on cash flow hedges reclassified to earnings, income tax effect $ (6) $ 2