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
6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Foreign currency translation gain (loss):
   
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Aggregate adjustment for the period, tax $ (3) $ (9)
Unrealized gain (loss) on marketable securities, net of tax:
   
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Current period changes in fair value, tax effect 2 5
Reclassification to earnings, tax effect (1) (8)
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 (57) (50)
Reclassification to earnings, tax effect 6 9
Unrecognized pension and postretirement benefit costs, net of tax:
   
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Reclassification to earnings, tax effect 34 57
Adjustment for Early Retirement Reinsurance Program, tax $ 4 $ 4