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
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Foreign currency translation gain (loss):
   
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Aggregate adjustment for the period, tax $ 11 $ (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 0 2
Reclassification to earnings, tax effect (1) (4)
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 (25) (32)
Reclassification to earnings, tax effect 0 (6)
Unrecognized pension and postretirement benefit costs, net of tax:
   
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Reclassification to earnings, tax effect 16 28
Adjustment for Early Retirement Reinsurance Program, tax $ 4 $ 4