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, 2014
Mar. 31, 2013
Dec. 31, 2013
Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated Other Comprehensive Income (Loss), Net of Tax $ (489) $ (3,595) $ (460)  
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax (36) (303)    
Foreign currency translation gain (loss):
        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated Other Comprehensive Income (Loss), Net of Tax (162) (169) (126) 134
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment Realized upon Sale or Liquidation, Net of Tax 0 (161)    
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax (36) (142)    
Aggregate adjustment for the period, tax 2 6    
Unrealized gain (loss) on marketable securities, net of tax:
        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated Other Comprehensive Income (Loss), Net of Tax (1) 4 (1) 6
Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, Net of Tax 0 0    
Current period changes in fair value, tax effect 0 (1)    
Reclassification to earnings, tax effect 0 0    
Unrealized gain (loss) on cash flow hedges, net of tax:
        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated Other Comprehensive Income (Loss), Net of Tax (239) (248) (219) (286)
Current period changes in fair value, tax effect (15) (7)    
Reclassification to earnings, tax effect 3 30    
Accumulated Defined Benefit Plans Adjustment [Member]
        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated Other Comprehensive Income (Loss), Net of Tax (87) (3,182) (114) (3,208)
Reclassification to earnings, tax effect $ 16 $ 18