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 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 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)) 39 (24) 3 (327)
Current period changes in fair value (net of tax effect of $0, and $2) 2 (6) 2 (8)
Current period changes in fair value (net of tax effect of $(25) and $(32)) (21) 20 (41) 58
Balance at end of period (596) (3,577) (596) (3,577)
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))     3 (166)
Balance at end of period (123) (193) (123) (193)
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)     2 (8)
Reclassification to earnings (net of tax effect of $(1) and $(4))     0 0
Balance at end of period 1 (2) 1 (2)
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))     (44) (22)
Reclassification to earnings (net of tax effect of $0 and $(6))     3 80
Balance at end of period (260) (228) (260) (228)
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)     715 54
Balance at end of period (214) (3,154) (214) (3,154)
Other Comprehensive Income (Loss), Finalization of Pension and Other Postretirement Benefit Plan Valuation, Net of Tax     $ (815) $ 0