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
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance at beginning of period     $ (6,195)  
Current period changes in fair value (net of tax effect of $(50) and $15) (5) (27) (68) 12
Current period changes in fair value (net of tax effect of $5, and $12) (3) 16 (7) 35
Aggregate adjustment for the period (net of tax effect of $(9) and $(43)) 7 (92) 132 (220)
Balance at end of period (5,977) (5,217) (5,977) (5,217)
Foreign currency translation gain (loss)
       
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance at beginning of period     (68) 37
Aggregate adjustment for the period (net of tax effect of $(9) and $(43))     132 (220)
Balance at end of period 64 (183) 64 (183)
Unrealized gain (loss) on marketable securities, net of tax
       
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance at beginning of period     12 (27)
Current period changes in fair value (net of tax effect of $5, and $12)     9 20
Reclassification to earnings (net of tax effect of $(8) and $9)     (16) 15
Balance at end of period 5 8 5 8
Unrealized gain (loss) on cash flow hedges, net of tax
       
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance at beginning of period     (239) (200)
Current period changes in fair value (net of tax effect of $(50) and $15)     (84) 26
Reclassification to earnings (net of tax effect of $9 and $(9))     16 (14)
Balance at end of period (307) (188) (307) (188)
Unrecognized pension and postretirement benefit costs, net of tax
       
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance at beginning of period     (5,900) (4,937)
Reclassification to earnings (net of tax effect of $91 and $53)     153 83
Adjustment for Early Retirement Reinsurance Program (net of tax effect of $4 and $0)     8  
Balance at end of period $ (5,739) $ (4,854) $ (5,739) $ (4,854)