Quarterly report pursuant to Section 13 or 15(d)

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

v3.5.0.2
Net Periodic Benefit Cost for Pension and Postretirement Benefit Plans (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
U.S. Pension Benefits        
Net Periodic Cost:        
Service cost $ 353 $ 381 $ 706 $ 763
Interest cost 457 424 914 847
Expected return on assets (629) (622) (1,258) (1,244)
Amortization of:        
Prior service cost 42 42 84 84
Net periodic benefit cost 223 225 446 450
U.S. Postretirement Medical Benefits        
Net Periodic Cost:        
Service cost 7 8 14 17
Interest cost 30 30 60 61
Expected return on assets (1) (4) (2) (8)
Amortization of:        
Prior service cost 1 1 2 2
Net periodic benefit cost 37 35 74 72
International Pension Benefits        
Net Periodic Cost:        
Service cost 13 13 25 25
Interest cost 11 11 21 22
Expected return on assets (15) (16) (29) (31)
Amortization of:        
Prior service cost 0 1 0 1
Net periodic benefit cost $ 9 $ 9 $ 17 $ 17