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Annual report pursuant to Section 13 and 15(d)

PENSION AND POST RETIREMENT BENEFITS - Components of Accumulated Other Comprehensive Loss (Income) (Details)

v3.24.0.1
PENSION AND POST RETIREMENT BENEFITS - Components of Accumulated Other Comprehensive Loss (Income) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Jan. 01, 2023
Defined Benefit Plan Disclosure [Line Items] Ìý Ìý Ìý
Service multiplier Ìý $ 115 $ 126
Pension Benefits Ìý Ìý Ìý
Defined Benefit Plan Disclosure [Line Items] Ìý Ìý Ìý
Actuarial loss (gain) on benefit obligation $ 42,000,000 41,000,000 Ìý
Actual returns on assets under (over) expected (60,000,000) 1,165,000,000 Ìý
Amortization of net actuarial gain (loss) (3,000,000) (13,000,000) Ìý
Amortization of prior service credits (costs) (18,000,000) (5,000,000) Ìý
Settlements 4,000,000 8,000,000 Ìý
Plan amendments 3,000,000 122,000,000 Ìý
OPEB Ìý Ìý Ìý
Defined Benefit Plan Disclosure [Line Items] Ìý Ìý Ìý
Actuarial loss (gain) on benefit obligation (12,000,000) (1,764,000,000) Ìý
Actual returns on assets under (over) expected (24,000,000) 134,000,000 Ìý
Amortization of net actuarial gain (loss) 145,000,000 43,000,000 Ìý
Amortization of prior service credits (costs) 17,000,000 3,000,000 Ìý
Settlements 0 0 Ìý
Plan amendments 8,000,000 (163,000,000) Ìý
Discount rates | Pension Benefits Ìý Ìý Ìý
Defined Benefit Plan Disclosure [Line Items] Ìý Ìý Ìý
Actuarial loss (gain) on benefit obligation 124,000,000 (1,143,000,000) Ìý
Discount rates | OPEB Ìý Ìý Ìý
Defined Benefit Plan Disclosure [Line Items] Ìý Ìý Ìý
Actuarial loss (gain) on benefit obligation 28,000,000 (441,000,000) Ìý
Demographic updates | Pension Benefits Ìý Ìý Ìý
Defined Benefit Plan Disclosure [Line Items] Ìý Ìý Ìý
Actuarial loss (gain) on benefit obligation (5,000,000) (102,000,000) Ìý
Demographic updates | OPEB Ìý Ìý Ìý
Defined Benefit Plan Disclosure [Line Items] Ìý Ìý Ìý
Actuarial loss (gain) on benefit obligation (208,000,000) (7,000,000) Ìý
Mortality | Pension Benefits Ìý Ìý Ìý
Defined Benefit Plan Disclosure [Line Items] Ìý Ìý Ìý
Actuarial loss (gain) on benefit obligation (2,000,000) 17,000,000 Ìý
Mortality | OPEB Ìý Ìý Ìý
Defined Benefit Plan Disclosure [Line Items] Ìý Ìý Ìý
Actuarial loss (gain) on benefit obligation (11,000,000) 0 Ìý
Per capita healthcare costs | Pension Benefits Ìý Ìý Ìý
Defined Benefit Plan Disclosure [Line Items] Ìý Ìý Ìý
Actuarial loss (gain) on benefit obligation 0 0 Ìý
Per capita healthcare costs | OPEB Ìý Ìý Ìý
Defined Benefit Plan Disclosure [Line Items] Ìý Ìý Ìý
Actuarial loss (gain) on benefit obligation 33,000,000 (1,333,000,000) Ìý
Other | Pension Benefits Ìý Ìý Ìý
Defined Benefit Plan Disclosure [Line Items] Ìý Ìý Ìý
Actuarial loss (gain) on benefit obligation (1,000,000) (8,000,000) Ìý
Other | OPEB Ìý Ìý Ìý
Defined Benefit Plan Disclosure [Line Items] Ìý Ìý Ìý
Actuarial loss (gain) on benefit obligation 0 0 Ìý
Actuarial loss (gain) on benefit obligation | Pension Benefits Ìý Ìý Ìý
Defined Benefit Plan Disclosure [Line Items] Ìý Ìý Ìý
Actuarial loss (gain) on benefit obligation 116,000,000 (1,236,000,000) Ìý
Actuarial loss (gain) on benefit obligation | OPEB Ìý Ìý Ìý
Defined Benefit Plan Disclosure [Line Items] Ìý Ìý Ìý
Actuarial loss (gain) on benefit obligation $ (158,000,000) $ (1,781,000,000) Ìý