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 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 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)) (251) 67 (248) (260)
Current period changes in fair value (net of tax effect of $0, and $2) (1) 1 1 (7)
Current period changes in fair value (net of tax effect of $(25) and $(32)) 210 12 169 70
Balance at end of period (611) (3,469) (611) (3,469)
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))     (248) (99)
Balance at end of period (374) (126) (374) (126)
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)     1 (7)
Reclassification to earnings (net of tax effect of $(1) and $(4))     0 0
Balance at end of period 0 (1) 0 (1)
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))     129 6
Reclassification to earnings (net of tax effect of $0 and $(6))     40 64
Balance at end of period (50) (216) (50) (216)
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)     742 82
Balance at end of period (187) (3,126) (187) (3,126)
Other Comprehensive Income (Loss), Finalization of Pension and Other Postretirement Benefit Plan Valuation, Net of Tax     $ (815) $ 0