Annual report pursuant to Section 13 and 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
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Foreign currency translation gain (loss)
      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Aggregate adjustment for the period, tax effect $ 11 $ (34) $ (27)
Unrealized gain (loss) on marketable securities, net of tax
      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Current period changes in fair value, tax effect 11 17 3
Reclassification to earnings, tax effect (14) 6 5
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 (16) (4) 4
Reclassification to earnings, tax effect 37 (19) (60)
Unrecognized pension and postretirement benefit costs, net of tax
      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Reclassification to earnings, tax effect 378 150 197
Net actuarial gain (loss) and prior service cost resulting from remeasurements of plan assets and liabilities, tax effect $ 622 $ 633 $ 219