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 9 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Sep. 30, 2013
Foreign currency translation gain (loss):
Sep. 30, 2012
Foreign currency translation gain (loss):
Dec. 31, 2012
Foreign currency translation gain (loss):
Dec. 31, 2011
Foreign currency translation gain (loss):
Sep. 30, 2013
Unrealized gain (loss) on marketable securities, net of tax:
Sep. 30, 2012
Unrealized gain (loss) on marketable securities, net of tax:
Dec. 31, 2012
Unrealized gain (loss) on marketable securities, net of tax:
Dec. 31, 2011
Unrealized gain (loss) on marketable securities, net of tax:
Sep. 30, 2013
Unrealized gain (loss) on cash flow hedges, net of tax:
Sep. 30, 2012
Unrealized gain (loss) on cash flow hedges, net of tax:
Dec. 31, 2012
Unrealized gain (loss) on cash flow hedges, net of tax:
Dec. 31, 2011
Unrealized gain (loss) on cash flow hedges, net of tax:
Sep. 30, 2013
Accumulated Defined Benefit Plans Adjustment [Member]
Sep. 30, 2012
Accumulated Defined Benefit Plans Adjustment [Member]
Dec. 31, 2012
Accumulated Defined Benefit Plans Adjustment [Member]
Dec. 31, 2011
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]                                          
Accumulated Other Comprehensive Income (Loss), Net of Tax $ (3,469) $ (2,929) $ (3,469) $ (2,929) $ (3,354) $ (126) $ 16 $ 134 $ (160) $ (1) $ 8 $ 6 $ 6 $ (216) $ (296) $ (286) $ (204) $ (3,126) $ (2,657) $ (3,208) $ (2,745)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment Realized upon Sale or Liquidation, Net of Tax           (161) 0                            
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax 67 243 (260) 176   (99) 176                            
Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, Net of Tax                   0 (5)                    
Aggregate adjustment for the period, tax           (2) (6)                            
Current period changes in fair value, tax effect                   (5) 5                    
Reclassification to earnings, tax effect                   0 (3)                    
Current period changes in fair value, tax effect                           3 (38)            
Reclassification to earnings, tax effect                           39 (16)            
Reclassification to earnings, tax effect                                   51 50    
Adjustment for Early Retirement Reinsurance Program, tax                                   $ 0 $ 2