Annual report pursuant to Section 13 and 15(d)

COMPANY-SPONSORED EMPLOYEE BENEFIT PLANS - Net Periodic Benefit Cost for Company Sponsored Pension and Postretirement Benefit Plans (Detail)

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COMPANY-SPONSORED EMPLOYEE BENEFIT PLANS - Net Periodic Benefit Cost for Company Sponsored Pension and Postretirement Benefit Plans (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Pension Benefits | U.S. Pension Benefits      
Net Periodic Benefit Cost:      
Service cost $ 1,661 $ 1,543 $ 1,412
Interest cost 1,799 1,813 1,828
Expected return on assets (3,201) (2,883) (2,516)
Amortization of:      
Amortization of prior service cost 193 192 166
Actuarial (gain) loss 1,603 729 2,520
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Curtailment 0 0 0
Net periodic benefit cost 2,055 1,394 3,410
Pension Benefits | International Pension Benefits      
Net Periodic Benefit Cost:      
Service cost 62 60 49
Interest cost 45 40 41
Expected return on assets (77) (66) (58)
Amortization of:      
Amortization of prior service cost 1 1 1
Actuarial (gain) loss 24 18 114
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Curtailment 0 2 0
Net periodic benefit cost 55 55 147
Postemployment Retirement Benefits | U.S. Pension Benefits      
Net Periodic Benefit Cost:      
Service cost 29 29 28
Interest cost 104 112 124
Expected return on assets (8) (7) (6)
Amortization of:      
Amortization of prior service cost 7 7 5
Actuarial (gain) loss 0 53 17
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Curtailment 0 0 0
Net periodic benefit cost $ 132 $ 194 $ 168