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 9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 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 $(47) and $(34)) 39 (113) (29) (101)
Current period changes in fair value (net of tax effect of $10, and $20) 2 9 (5) 44
Aggregate adjustment for the period (net of tax effect of $4 and $(36)) (179) 125 (47) (95)
Balance at end of period (6,040) (5,153) (6,040) (5,153)
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 $4 and $(36))     (47) (95)
Balance at end of period (115) (58) (115) (58)
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 $10, and $20)     16 34
Reclassification to earnings (net of tax effect of $(13) and $6)     (21) 10
Balance at end of period 7 17 7 17
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 $(47) and $(34))     (80) (55)
Reclassification to earnings (net of tax effect of $30 and $(27))     51 (46)
Balance at end of period (268) (301) (268) (301)
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 $138 and $78)     228 126
Adjustment for Early Retirement Reinsurance Program (net of tax effect of $4 and $0)     8  
Balance at end of period $ (5,664) $ (4,811) $ (5,664) $ (4,811)