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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 |

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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 3A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480535/715-20-45-3A Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480482/715-20-55-18 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h)(4) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(4) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-6 + Details
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