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, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Balance at beginning of period     $ (3,354)  
Aggregate adjustment for the period (net of tax effect of $0 and $(9)) (24) (158) (327) (67)
Current period changes in fair value (net of tax effect of $0, and $2) (6) 2 (8) 1
Current period changes in fair value (net of tax effect of $(25) and $(32)) 20 (43) 58 (84)
Balance at end of period (3,577) (3,192) (3,577) (3,192)
Foreign currency translation gain (loss):
        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Balance at beginning of period     134 (160)
Aggregate adjustment for the period (net of tax effect of $0 and $(9))     (166) (67)
Balance at end of period (193) (227) (193) (227)
Unrealized gain (loss) on marketable securities, net of tax:
        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Balance at beginning of period     6 6
Current period changes in fair value (net of tax effect of $0, and $2)     (8) 4
Reclassification to earnings (net of tax effect of $(1) and $(4))     0 (3)
Balance at end of period (2) 7 (2) 7
Unrealized gain (loss) on cash flow hedges, net of tax:
        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Balance at beginning of period     (286) (204)
Current period changes in fair value (net of tax effect of $(25) and $(32))     (22) (94)
Reclassification to earnings (net of tax effect of $0 and $(6))     80 10
Balance at end of period (228) (288) (228) (288)
Accumulated Defined Benefit Plans Adjustment [Member]
        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Balance at beginning of period     (3,208) (2,745)
Reclassification to earnings (net of tax effect of $16 and $28)     54 55
Adjustment for Early Retirement Reinsurance Program (net of tax effect of $4 and $4) 0     (6)
Balance at end of period $ (3,154) $ (2,684) $ (3,154) $ (2,684)