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, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 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)) (158) 7 (67) 132
Current period changes in fair value (net of tax effect of $0, and $2) 2 (3) 1 (7)
Current period changes in fair value (net of tax effect of $(25) and $(32)) (43) (5) (84) (68)
Balance at end of period (3,192) (2,476) (3,192) (2,476)
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))     (67) 132
Balance at end of period (227) 64 (227) 64
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)     4 9
Reclassification to earnings (net of tax effect of $(1) and $(4))     (3) (16)
Balance at end of period 7 5 7 5
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))     (94) (84)
Reclassification to earnings (net of tax effect of $0 and $(6))     10 16
Balance at end of period (288) (307) (288) (307)
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)     55 94
Adjustment for Early Retirement Reinsurance Program (net of tax effect of $4 and $4) (6)     (8)
Balance at end of period $ (2,684) $ (2,238) $ (2,684) $ (2,238)