Quarterly report pursuant to Section 13 or 15(d)

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

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Net Periodic Benefit Cost for Pension and Postretirement Benefit Plans (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Defined Benefit Pension Plan | U.S. Pension Benefits        
Net Periodic Cost:        
Service cost $ 360 $ 415 $ 719 $ 831
Interest cost 517 450 1,034 899
Expected return on assets (783) (800) (1,565) (1,601)
Amortization of prior service cost 55 48 109 97
Net periodic benefit cost 149 113 297 226
Defined Benefit Pension Plan | International Pension Benefits        
Net Periodic Cost:        
Service cost 14 16 28 32
Interest cost 11 11 23 23
Expected return on assets (19) (19) (38) (39)
Amortization of prior service cost 1 0 1 0
Net periodic benefit cost 7 8 14 16
U.S. Postretirement Medical Benefits        
Net Periodic Cost:        
Service cost 6 7 12 14
Interest cost 27 26 54 52
Expected return on assets (2) (2) (4) (4)
Amortization of prior service cost 1 2 3 4
Net periodic benefit cost $ 32 $ 33 $ 65 $ 66