Annual report pursuant to Section 13 and 15(d)

PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS - Net periodic benefit cost for pension and other postretirement benefit plans (Details)

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PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS - Net periodic benefit cost for pension and other postretirement benefit plans (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Net periodic pension and other postretirement benefit cost      
Corridor Approach for Amortizing Actuarial Gains and Losses 10.00%    
Pension plans      
Net periodic pension and other postretirement benefit cost      
Service cost $ 94 $ 93 $ 97
Interest cost 322 232 183
Expected Return on Plan Assets (475) (558) (606)
Amortization of prior service cost (credit) 1 0 0
Amortization of net actuarial loss (gain) 96 109 146
Net periodic benefit cost (income) 38 (124) (180)
Settlement charges (credits) 81 (1) 117
Curtailment credits 0 (1) (1)
Special termination benefits 1 1 3
Other 0 1 0
Total cost (income) recognized in the statement of income 120 (124) (61)
Defined Benefit Plan, Plan Assets, Payment for Settlement 260 26  
Pension plans | Defined Benefit Plan, Funded Plan      
Net periodic pension and other postretirement benefit cost      
Settlement charges (credits) 76    
Defined Benefit Plan, Plan Assets, Payment for Settlement 259    
Other postretirement benefit plans      
Net periodic pension and other postretirement benefit cost      
Service cost 4 7 9
Interest cost 27 17 15
Expected Return on Plan Assets (14) (16) (17)
Amortization of prior service cost (credit) (3) (3) (2)
Amortization of net actuarial loss (gain) (5) 0 4
Net periodic benefit cost (income) 9 5 9
Settlement charges (credits) (14) 0 0
Curtailment credits 0 0 (1)
Special termination benefits 0 0 0
Other 0 0 0
Total cost (income) recognized in the statement of income (5) 5 $ 8
Defined Benefit Plan, Plan Assets, Payment for Settlement $ 187 $ 0