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, 2012
Mar. 31, 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)) 91 125
Current period changes in fair value (net of tax effect of $0, and $2) (1) (4)
Current period changes in fair value (net of tax effect of $(25) and $(32)) (41) (63)
Balance at end of period (3,020) (2,522)
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)) 91 125
Balance at end of period (69) 57
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) 1 4
Reclassification to earnings (net of tax effect of $(1) and $(4)) (2) (8)
Balance at end of period 5 8
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)) (42) (53)
Reclassification to earnings (net of tax effect of $0 and $(6)) 1 (10)
Balance at end of period (245) (302)
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) 28 47
Adjustment for Early Retirement Reinsurance Program (net of tax effect of $4 and $4) (6) (8)
Balance at end of period $ (2,711) $ (2,285)