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PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS - Accumulated benefit obligations in excess of fair value of plan assets (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Pension plans
Accumulated benefit obligations in excess of the fair value of plan assets
Accumulated Benefit Obligations	$ 5,165	$ 880
Fair value of plan assets	4,379	138
Other postretirement benefit plans
Accumulated benefit obligations in excess of the fair value of plan assets
Accumulated Benefit Obligations	297	166
Fair value of plan assets	$ 176	$ 0

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- References

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- Definition

Amount of accumulated benefit obligation for defined benefit plan with accumulated benefit obligation in excess of plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
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Amount of plan asset for defined benefit plan with accumulated benefit obligation in excess of plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 17
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-URI https://asc.fasb.org//1943274/2147480482/715-20-55-17

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Section 50
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-URI https://asc.fasb.org//1943274/2147480506/715-20-50-3

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