v3.25.4
EMPLOYEE BENEFIT PLANS - Benefit Obligations, Fair Value of Plan Assets and Funded Status (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Pension Benefits      
Change in Benefit Obligation      
Benefit obligation at beginning of period $ 14,967 $ 15,911  
Service cost 273 233 $ 95
Interest cost 831 820 855
Actuarial loss/(gain) 266 (738)  
Benefits paid, including lump sums and annuities (1,315) (1,259)  
Participant contributions 0 0  
Special termination benefits 0 0 0
Benefit obligation at end of period 15,022 14,967 15,911
Change in Fair Value of Plan Assets      
Fair value of plan assets at beginning of period 15,905 15,766  
Actual gain on plan assets 2,338 1,142  
Employer contributions 352 256  
Benefits paid, including lump sums and annuities (1,315) (1,259)  
Participant contributions 0 0  
Fair value of plan assets at end of period 17,280 15,905 15,766
Funded Status of Plan      
Funded status at end of period 2,258 938  
Other Postretirement and Postemployment Benefits      
Change in Benefit Obligation      
Benefit obligation at beginning of period 3,265 3,503  
Service cost 132 92 71
Interest cost 181 182 200
Actuarial loss/(gain) 141 (50)  
Benefits paid, including lump sums and annuities (489) (497)  
Participant contributions 27 30  
Special termination benefits 1 5 0
Benefit obligation at end of period 3,258 3,265 3,503
Change in Fair Value of Plan Assets      
Fair value of plan assets at beginning of period 27 33  
Actual gain on plan assets 10 (7)  
Employer contributions 466 468  
Benefits paid, including lump sums and annuities (489) (497)  
Participant contributions 27 30  
Fair value of plan assets at end of period 41 27 $ 33
Funded Status of Plan      
Funded status at end of period $ (3,217) $ (3,238)