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, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Balance at beginning of period     $ (4,483)  
Translation adjustment (net of tax effect of $(146) and $24) $ 32 $ (7) 86 $ (12)
Current period changes in fair value (net of tax effect of $1 and $3) 0 (1) 1 4
Current period changes in fair value (net of tax effect of $(162) and $(15)) (86) (64) (278) (183)
Balance at end of period (4,224) (3,651) (4,224) (3,651)
Foreign currency translation gain (loss):        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Balance at beginning of period     (1,016) (897)
Translation adjustment (net of tax effect of $(146) and $24)     86 (12)
Balance at end of period (930) (909) (930) (909)
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 $1 and $3)     2 4
Balance at end of period 0 3 0 3
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax     0 0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax     1 0
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 $(162) and $(15))     (269) (24)
Reclassification to earnings (net of tax effect of $(6) and $(96))     (9) (159)
Balance at end of period (323) (116) (323) (116)
Reclassification to earnings, tax effect     (6) (96)
Accumulated Defined Benefit Plans Adjustment [Member]        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Balance at beginning of period     (3,421) (2,709)
Remeasurement of plan assets and liabilities (net of tax effect of $214 and $0)     356 0
Reclassification to earnings (net of tax effect of $56 and $48)     94 80
Balance at end of period (2,971) (2,629) (2,971) (2,629)
Income Tax Expense Benefit [Member] | Unrealized gain (loss) on marketable securities, net of tax:        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax 0 0 0 0
Income Tax Expense Benefit [Member] | Unrealized gain (loss) on cash flow hedges, net of tax:        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Reclassification to earnings, tax effect 1 (29) (6) (96)
Income Tax Expense Benefit [Member] | Accumulated Defined Benefit Plans Adjustment [Member]        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Tax 19 15 56 48
Net Income [Member] [Member]        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
TotalOtherComprehensiveIncomeReclassification, Net of Tax (32) 20 (84) 79
Net Income [Member] [Member] | Unrealized gain (loss) on marketable securities, net of tax:        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax 1 0 1 0
Net Income [Member] [Member] | Unrealized gain (loss) on cash flow hedges, net of tax:        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Reclassification to earnings (net of tax effect of $(6) and $(96)) 2 (47) (9) (159)
Net Income [Member] [Member] | Accumulated Defined Benefit Plans Adjustment [Member]        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Reclassification to earnings (net of tax effect of $56 and $48) (31) (27) (94) (80)
Labor and Related Expense [Member] | Accumulated Defined Benefit Plans Adjustment [Member]        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Other Comprehensive (Income) Loss, Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service Cost (Credit), before Tax (50) (42) (150) (128)
Foreign exchange contracts | Interest Expense | Unrealized gain (loss) on cash flow hedges, net of tax:        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax 3 83    
Foreign exchange contracts | Revenue [Member] | Unrealized gain (loss) on cash flow hedges, net of tax:        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax     35 274
Interest rate contracts | Interest Expense | Unrealized gain (loss) on cash flow hedges, net of tax:        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax $ (6) $ (7) $ (20) $ (19)