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 (Details)

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COMPANY-SPONSORED EMPLOYEE BENEFIT PLANS - Net Periodic Benefit Cost for Company Sponsored Pension and Postretirement Benefit Plans (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Net Periodic Benefit Cost:      
Curtailment and settlement (gain) loss   $ (34)  
Pension Benefits | United States      
Net Periodic Benefit Cost:      
Service cost $ 1,172 2,024 $ 1,897
Interest cost 2,508 1,950 1,948
Expected return on plan assets (2,967) (3,280) (3,327)
Amortization of prior service cost 106 93 139
Actuarial (gain) loss 393 (875) (3,284)
Curtailment and settlement (gain) loss 0 0 0
Net periodic benefit cost 1,212 (88) (2,627)
Pension Benefits | International Pension Benefits      
Net Periodic Benefit Cost:      
Service cost 43 68 76
Interest cost 66 45 38
Expected return on plan assets (84) (78) (68)
Amortization of prior service cost 1 1 2
Actuarial (gain) loss (42) (152) (12)
Curtailment and settlement (gain) loss 8 (34) 0
Net periodic benefit cost (8) (150) 36
Postemployment Retirement Benefits | United States      
Net Periodic Benefit Cost:      
Service cost 20 30 28
Interest cost 116 83 81
Expected return on plan assets (12) (4) (5)
Amortization of prior service cost 2 0 7
Actuarial (gain) loss 0 0 24
Curtailment and settlement (gain) loss 0 0 0
Net periodic benefit cost $ 126 $ 109 $ 135