Quarterly report pursuant to Section 13 or 15(d)

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

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Activity in Accumulated Other Comprehensive Income (Loss) (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
Foreign currency translation gain (loss):
Mar. 31, 2012
Foreign currency translation gain (loss):
Dec. 31, 2012
Foreign currency translation gain (loss):
Mar. 31, 2013
Unrealized gain (loss) on marketable securities, net of tax:
Mar. 31, 2012
Unrealized gain (loss) on marketable securities, net of tax:
Dec. 31, 2012
Unrealized gain (loss) on marketable securities, net of tax:
Mar. 31, 2013
Unrealized gain (loss) on cash flow hedges, net of tax:
Mar. 31, 2012
Unrealized gain (loss) on cash flow hedges, net of tax:
Dec. 31, 2012
Unrealized gain (loss) on cash flow hedges, net of tax:
Mar. 31, 2013
Accumulated Defined Benefit Plans Adjustment [Member]
Mar. 31, 2013
Accumulated Defined Benefit Plans Adjustment [Member]
Mar. 31, 2012
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]                            
Balance at beginning of period $ (3,354)     $ (160) $ 134   $ 6 $ 6   $ (204) $ (286)   $ (3,208) $ (2,745)
Aggregate adjustment for the period (net of tax effect of $0 and $(9)) (303) 91 (142) 91                    
Current period changes in fair value (net of tax effect of $0, and $2) (2) (1)       (2) 1              
Current period changes in fair value (net of tax effect of $(25) and $(32)) 38 (41)             (11) (42)        
Reclassification to earnings (net of tax effect of $16 and $28)                       26   28
Reclassification to earnings (net of tax effect of $(1) and $(4))           0 (2)              
Reclassification to earnings (net of tax effect of $0 and $(6))                 49 1        
Adjustment for Early Retirement Reinsurance Program (net of tax effect of $4 and $4)                         0 (6)
Balance at end of period $ (3,595) $ (3,020) $ (169) $ (69) $ 134 $ 4 $ 5 $ 6 $ (248) $ (245) $ (286) $ (3,182) $ (3,182) $ (2,711)