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, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Balance at beginning of period     $ (3,103)  
Aggregate adjustment for the period (net of tax effect of $0 and $(9)) 243 (179) 176 (47)
Current period changes in fair value (net of tax effect of $0, and $2) 1 2 2 (5)
Current period changes in fair value (net of tax effect of $(25) and $(32)) (8) 39 (92) (29)
Balance at end of period (2,929) (2,569) (2,929) (2,569)
Foreign currency translation gain (loss):
       
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Balance at beginning of period     (160) (68)
Aggregate adjustment for the period (net of tax effect of $0 and $(9))     176 (47)
Balance at end of period 16 (115) 16 (115)
Unrealized gain (loss) on marketable securities, net of tax:
       
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Balance at beginning of period     6 12
Current period changes in fair value (net of tax effect of $0, and $2)     7 16
Reclassification to earnings (net of tax effect of $(1) and $(4))     (5) (21)
Balance at end of period 8 7 8 7
Unrealized gain (loss) on cash flow hedges, net of tax:
       
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Balance at beginning of period     (204) (239)
Current period changes in fair value (net of tax effect of $(25) and $(32))     (64) (80)
Reclassification to earnings (net of tax effect of $0 and $(6))     (28) 51
Balance at end of period (296) (268) (296) (268)
Unrecognized pension and postretirement benefit costs, net of tax:
       
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Balance at beginning of period     (2,745) (2,340)
Reclassification to earnings (net of tax effect of $16 and $28)     84 139
Adjustment for Early Retirement Reinsurance Program (net of tax effect of $4 and $4) (4)     (8)
Balance at end of period $ (2,657) $ (2,193) $ (2,657) $ (2,193)