Quarterly report pursuant to Section 13 or 15(d)

Activity in Accumulated Other Comprehensive Income (Loss) (Detail)

v3.7.0.1
Activity in Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance at beginning of period $ (4,483)  
Aggregate adjustment for the period (net of tax effect of $0 and $(9)) 30 $ 26
Current period changes in fair value (net of tax effect of $0, and $2) 0 3
Current period changes in fair value (net of tax effect of $(25) and $(32)) (41) (162)
Balance at end of period (4,462) (3,647)
Foreign currency translation gain (loss):    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance at beginning of period (1,016) (897)
Aggregate adjustment for the period (net of tax effect of $0 and $(9)) 30 26
Balance at end of period (986) (871)
Unrealized gain (loss) on marketable securities, net of tax:    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance at beginning of period (1) (1)
Current period changes in fair value (net of tax effect of $0, and $2) 0 3
Balance at end of period (1) 2
Unrealized gain (loss) on cash flow hedges, net of tax:    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance at beginning of period (45) 67
Current period changes in fair value (net of tax effect of $(25) and $(32)) (30) (100)
Reclassification to earnings (net of tax effect of $0 and $(6)) (11) (62)
Balance at end of period (86) (95)
Accumulated Defined Benefit Plans Adjustment [Member]    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance at beginning of period (3,421) (2,709)
Reclassification to earnings (net of tax effect of $16 and $28) 32 26
Balance at end of period $ (3,389) $ (2,683)