Quarterly report pursuant to Section 13 or 15(d)

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

v3.4.0.3
Activity in Accumulated Other Comprehensive Income (Loss) (Phantoms) (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated Other Comprehensive Income (Loss), Net of Tax $ (3,647) $ (3,688) $ (3,540)  
Change in foreign currency translation adjustment, net of tax 26 (304)    
Foreign currency translation gain (loss):        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated Other Comprehensive Income (Loss), Net of Tax (871) (761) (897) $ (457)
Change in foreign currency translation adjustment, net of tax 26 (304)    
Aggregate adjustment for the period, tax 0 0    
Unrealized gain (loss) on marketable securities, net of tax:        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated Other Comprehensive Income (Loss), Net of Tax 2 2 (1) 0
Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, Net of Tax 0 0    
Current period changes in fair value, tax effect 2 1    
Reclassification to earnings, tax effect 0 0    
Unrealized gain (loss) on cash flow hedges, net of tax:        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated Other Comprehensive Income (Loss), Net of Tax (95) 237 67 61
Current period changes in fair value, tax effect (60) 120    
Reclassification to earnings, tax effect (38) 14    
Accumulated Defined Benefit Plans Adjustment [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated Other Comprehensive Income (Loss), Net of Tax (2,683) (3,166) $ (2,709) $ (3,198)
Reclassification to earnings, tax effect 17 17    
Other Comprehensive Income (Loss), Finalization of Pension and Other Postretirement Benefit Plan Valuation, Tax $ 0 $ 3