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POSTRETIREMENT BENEFIT PLANS - Schedule of Expected Benefit Payments (Details)
$ in Millions
Dec. 31, 2023
USD ($)
Pension Plans | Principal Pension Plans  
Defined Benefit Plan Disclosure [Line Items]  
2024 $ 1,277
2025 1,289
2026 1,300
2027 1,307
2028 1,310
2029-2033 6,449
Pension Plans | Other Pension Plans  
Defined Benefit Plan Disclosure [Line Items]  
2024 226
2025 239
2026 239
2027 243
2028 254
2029-2033 1,334
OPEB Plans  
Defined Benefit Plan Disclosure [Line Items]  
2024 130
2025 124
2026 119
2027 114
2028 110
2029-2033 $ 454