Quarterly report pursuant to Section 13 or 15(d)

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

v3.8.0.1
Activity in Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance at beginning of period $ (4,867)  
Translation adjustment (net of tax effect of $(9) and $(14)) (6) $ 30
Current period changes in fair value (net of tax effect of $(1) and $0) (3) 0
Current period changes in fair value (net of tax effect of $(33) and $(17)) (66) (41)
Balance at end of period (5,638) (4,462)
Foreign currency translation gain (loss):    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance at beginning of period (930) (1,016)
Translation adjustment (net of tax effect of $(9) and $(14)) (6) 30
Balance at end of period (983) (986)
Unrealized gain (loss) on marketable securities, net of tax:    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance at beginning of period (2) (1)
Current period changes in fair value (net of tax effect of $(1) and $0) (4) 0
Balance at end of period (5) (1)
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 (366) (45)
Current period changes in fair value (net of tax effect of $(33) and $(17)) (102) (30)
Reclassification to earnings (net of tax effect of $12 and $(7)) 36 (11)
Balance at end of period (511) (86)
Reclassification to earnings, tax effect 12 (7)
Accumulated Defined Benefit Plans Adjustment [Member]    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance at beginning of period (3,569) (3,421)
Reclassification to earnings (net of tax effect of $12 and $18) 39 32
Balance at end of period (4,139) (3,389)
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 1 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 12 (7)
Income Tax Expense Benefit [Member] | Accumulated Defined Benefit Plans Adjustment [Member]    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax 12 18
Net Income [Member] [Member]    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
TotalOtherComprehensiveIncomeReclassification, Net of Tax (76) (21)
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
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 $12 and $(7)) 36 (11)
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 $12 and $18) (39) (32)
Labor and Related Expense [Member] | Accumulated Defined Benefit Plans Adjustment [Member]    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax (51) (50)
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 (42) 25
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)