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, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Balance at beginning of period     $ (3,354)  
Aggregate adjustment for the period (net of tax effect of $0 and $(9)) 67 243 (260) 176
Current period changes in fair value (net of tax effect of $0, and $2) 1 1 (7) 2
Current period changes in fair value (net of tax effect of $(25) and $(32)) 12 (8) 70 (92)
Balance at end of period (3,469) (2,929) (3,469) (2,929)
Foreign currency translation gain (loss):
       
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Balance at beginning of period     134 (160)
Aggregate adjustment for the period (net of tax effect of $0 and $(9))     (99) 176
Balance at end of period (126) 16 (126) 16
Unrealized gain (loss) on marketable securities, net of tax:
       
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Balance at beginning of period     6 6
Current period changes in fair value (net of tax effect of $0, and $2)     (7) 7
Reclassification to earnings (net of tax effect of $(1) and $(4))     0 (5)
Balance at end of period (1) 8 (1) 8
Unrealized gain (loss) on cash flow hedges, net of tax:
       
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Balance at beginning of period     (286) (204)
Current period changes in fair value (net of tax effect of $(25) and $(32))     6 (64)
Reclassification to earnings (net of tax effect of $0 and $(6))     64 (28)
Balance at end of period (216) (296) (216) (296)
Accumulated Defined Benefit Plans Adjustment [Member]
       
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Balance at beginning of period     (3,208) (2,745)
Reclassification to earnings (net of tax effect of $16 and $28)     82 84
Adjustment for Early Retirement Reinsurance Program (net of tax effect of $4 and $4) 0     (4)
Balance at end of period $ (3,126) $ (2,657) $ (3,126) $ (2,657)