Quarterly report pursuant to Section 13 or 15(d)

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

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EMPLOYEE BENEFIT PLANS - Net Periodic Benefit Cost for Pension and Postretirement Benefit Plans (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Defined Benefit Pension Plan | U.S. Pension Benefits    
Net Periodic Cost:    
Service cost $ 553 $ 464
Interest cost 488 494
Expected return on assets (846) (888)
Amortization of prior service cost 33 55
Net periodic benefit (income) cost (3,062) 125
Defined Benefit Plan, Amortization of Gain (Loss) (3,290) 0
Estimated future employer contributions to defined benefit plan, current fiscal year 72,000  
Defined Benefit Pension Plan | International Pension Benefits    
Net Periodic Cost:    
Service cost 19 16
Interest cost 10 10
Expected return on assets (17) (21)
Amortization of prior service cost 0 0
Net periodic benefit (income) cost 12 5
Defined Benefit Plan, Amortization of Gain (Loss) 0 0
U.S. Postretirement Medical Benefits | U.S. Pension Benefits    
Net Periodic Cost:    
Service cost 7 7
Interest cost 19 23
Expected return on assets (2) (2)
Amortization of prior service cost 2 2
Net periodic benefit (income) cost 26 30
Defined Benefit Plan, Amortization of Gain (Loss) 0 $ 0
Estimated future employer contributions to defined benefit plan, current fiscal year $ 63,000