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
Mar. 31, 2014
Mar. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance at beginning of period $ (460)  
Aggregate adjustment for the period (net of tax effect of $0 and $(9)) (36) (303)
Current period changes in fair value (net of tax effect of $0, and $2) 0 (2)
Current period changes in fair value (net of tax effect of $(25) and $(32)) (20) 38
Balance at end of period (489) (3,595)
Foreign currency translation gain (loss):
    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance at beginning of period (126) 134
Aggregate adjustment for the period (net of tax effect of $0 and $(9)) (36) (142)
Balance at end of period (162) (169)
Unrealized gain (loss) on marketable securities, net of tax:
    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance at beginning of period (1) 6
Current period changes in fair value (net of tax effect of $0, and $2) 0 (2)
Reclassification to earnings (net of tax effect of $(1) and $(4)) 0 0
Balance at end of period (1) 4
Unrealized gain (loss) on cash flow hedges, net of tax:
    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance at beginning of period (219) (286)
Current period changes in fair value (net of tax effect of $(25) and $(32)) (24) (11)
Reclassification to earnings (net of tax effect of $0 and $(6)) 4 49
Balance at end of period (239) (248)
Accumulated Defined Benefit Plans Adjustment [Member]
    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance at beginning of period (114) (3,208)
Reclassification to earnings (net of tax effect of $16 and $28) 27 26
Balance at end of period $ (87) $ (3,182)