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, 2019
Dec. 31, 2018
Dec. 31, 2017
Pension Benefits | United States      
Net Periodic Benefit Cost:      
Service cost $ 1,439 $ 1,661 $ 1,543
Interest cost 2,067 1,799 1,813
Expected return on assets (3,130) (3,201) (2,883)
Amortization of:      
Amortization of prior service cost 218 193 192
Actuarial (gain) loss 2,296 1,603 729
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Curtailment 0 0 0
Net periodic benefit cost 2,890 2,055 1,394
Pension Benefits | International Pension Benefits      
Net Periodic Benefit Cost:      
Service cost 57 62 60
Interest cost 47 45 40
Expected return on assets (76) (77) (66)
Amortization of:      
Amortization of prior service cost 2 1 1
Actuarial (gain) loss 54 24 18
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Curtailment 0 0 2
Net periodic benefit cost 84 55 55
Postemployment Retirement Benefits | United States      
Net Periodic Benefit Cost:      
Service cost 23 29 29
Interest cost 108 104 112
Expected return on assets (8) (8) (7)
Amortization of:      
Amortization of prior service cost 7 7 7
Actuarial (gain) loss 37 0 53
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Curtailment 0 0 0
Net periodic benefit cost $ 167 $ 132 $ 194