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, unless otherwise specified
9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Foreign currency translation gain (loss):
   
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Aggregate adjustment for the period, tax $ (6) $ 4
Unrealized gain (loss) on marketable securities, net of tax:
   
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Current period changes in fair value, tax effect 5 10
Reclassification to earnings, tax effect (3) (13)
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 (38) (47)
Reclassification to earnings, tax effect (16) 30
Unrecognized pension and postretirement benefit costs, net of tax:
   
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Reclassification to earnings, tax effect 50 85
Adjustment for Early Retirement Reinsurance Program, tax $ 2 $ 4