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PENSION AND OTHER POSTEMPLOYMENT BENEFITS - Obligations and Funded Status (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Pension      
Change in benefit obligation:      
Benefit obligation as of January 1 $ 8,363 $ 8,828  
Service cost 140 139 $ 184
Interest cost 398 428 273
Plan participants’ contributions 0 0  
Special termination benefits 0 21  
Medicare retiree drug subsidy 0 0  
Lift-out transaction 0 (719)  
Actuarial loss (gain) (526) 256  
Benefits paid (551) (590)  
Benefit obligation as of December 31 7,824 8,363 8,828
Change in fair value of plan assets:      
Fair value of plan assets as of January 1 6,879 6,693  
Actual return on plan assets (62) 682  
Lift-out transaction 0 (683)  
Company contributions 30 777  
Plan participants’ contributions 0 0  
Benefits paid (551) (590)  
Fair value of plan assets as of December 31 6,296 6,879 6,693
Funded Status:      
Funded Status - Net asset (liability) as of December 31 (1,528) (1,484)  
Accumulated benefit obligation 7,572 7,324  
Amounts Recognized in AOCI:      
Prior service cost (credit) 2 4  
Pension | Qualified plan      
Funded Status:      
Funded Status - Net asset (liability) as of December 31 (1,165) (1,090)  
Pension | Non-qualified plans      
Funded Status:      
Funded Status - Net asset (liability) as of December 31 (363) (394)  
OPEB      
Change in benefit obligation:      
Benefit obligation as of January 1 441 439  
Service cost 3 2 3
Interest cost 20 21 11
Plan participants’ contributions 4 4  
Special termination benefits 0 8  
Medicare retiree drug subsidy 1 0  
Lift-out transaction 0 0  
Actuarial loss (gain) (14) 8  
Benefits paid (48) (41)  
Benefit obligation as of December 31 407 441 439
Change in fair value of plan assets:      
Fair value of plan assets as of January 1 516 460  
Actual return on plan assets 65 69  
Lift-out transaction 0 0  
Company contributions 30 24  
Plan participants’ contributions 4 4  
Benefits paid (48) (41)  
Fair value of plan assets as of December 31 567 516 $ 460
Funded Status:      
Funded Status - Net asset (liability) as of December 31 160 75  
Accumulated benefit obligation 0 0  
Amounts Recognized in AOCI:      
Prior service cost (credit) 1 (1)  
OPEB | Qualified plan      
Funded Status:      
Funded Status - Net asset (liability) as of December 31 0 0  
OPEB | Non-qualified plans      
Funded Status:      
Funded Status - Net asset (liability) as of December 31 $ 0 $ 0