Quarterly report pursuant to Section 13 or 15(d)

Net Periodic Benefit Cost for Pension and Postretirement Benefit Plans (Detail)

v3.4.0.3
Net Periodic Benefit Cost for Pension and Postretirement Benefit Plans (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
U.S. Pension Benefits    
Net Periodic Cost:    
Service cost $ 352 $ 382
Interest cost 457 423
Expected return on assets (629) (622)
Amortization of:    
Prior service cost 42 42
Net periodic benefit cost 222 225
U.S. Postretirement Medical Benefits    
Net Periodic Cost:    
Service cost 7 9
Interest cost 30 31
Expected return on assets (1) (4)
Amortization of:    
Prior service cost 1 1
Net periodic benefit cost 37 37
International Pension Benefits    
Net Periodic Cost:    
Service cost 12 12
Interest cost 10 11
Expected return on assets (14) (15)
Amortization of:    
Prior service cost 0 0
Net periodic benefit cost $ 8 $ 8