Quarterly report pursuant to Section 13 or 15(d)

Activity in Accumulated Other Comprehensive Income (Loss) (Parenthetical) (Detail)

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Activity in Accumulated Other Comprehensive Income (Loss) (Parenthetical) (Detail) (USD $)
In Millions
9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Foreign currency translation gain (loss)
   
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Aggregate adjustment for the period, tax $ 4 $ (36)
Unrealized gain (loss) on marketable securities, net of tax
   
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Current period changes in fair value, tax effect 10 20
Reclassification to earnings, tax effect (13) 6
Unrealized gain (loss) on cash flow hedges, net of tax
   
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Current period changes in fair value, tax effect (47) (34)
Reclassification to earnings, tax effect 30 (27)
Unrecognized pension and postretirement benefit costs, net of tax
   
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Reclassification to earnings, tax effect 138 78
Adjustment for Early Retirement Reinsurance Program, tax effect $ 4 $ 0