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PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS - Changes and amounts in AOCI for pension and other postretirement benefit plans (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Pension plans |  |
Net periodic pension and other postretirement benefit cost |  |
Prior Service Credit (Cost) | $ (17) | $ (17)
Net actuarial gain (loss) | (1,889) | (1,738)
Changes in AOCI for our benefit plans, pretax |  |
Beginning balance in AOCI | (1,755) | (2,125)
Recognized prior service cost (credit) | 1 | 0
Recognized net actuarial loss (gain) | 177 | 107
Prior service cost arising during the year | 0 | (9)
Net actuarial gain (loss) occurring during the year | (313) | 232
Net foreign currency translation adjustments | (16) | 40
Balance in AOCI | (1,906) | (1,755)
Other postretirement benefit plans |  |
Net periodic pension and other postretirement benefit cost |  |
Prior Service Credit (Cost) | 20 | 24
Net actuarial gain (loss) | 41 | 71
Changes in AOCI for our benefit plans, pretax |  |
Beginning balance in AOCI | 95 | (4)
Recognized prior service cost (credit) | (3) | (3)
Recognized net actuarial loss (gain) | (19) | 0
Prior service cost arising during the year | (1) | 0
Net actuarial gain (loss) occurring during the year | (12) | 104
Net foreign currency translation adjustments | 1 | (2)
Balance in AOCI | $ 61 | $ 95

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- Definition Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-14A Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 10A -Subparagraph (i-k) -SubTopic 10 -Topic 220 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-10A Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (j) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-14A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (j) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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