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Pension and Other Postretirement Benefits - Schedule of Changes in Net Loss and Prior Service Cost/(Credit) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Pension Plan |  |  |
Net loss / (gain) |  |  |
Balance at beginning of period | $ 686 | $ 712 | $ 814
Reclassification to net periodic benefit cost | (551) | (46) | (49)
Current year (gain) / loss | (25) | 22 | (45)
Amendments | 0 | (1) | 0
Foreign currency translation | (1) | (1) | (8)
Balance at end of period | 109 | 686 | 712
Prior service |  |  |
Balance at beginning of period | (1) | 0 | 2
Reclassification to net periodic benefit cost | (1) | (1) | (1)
Current year (gain) / loss | 0 | 0 | (1)
Amendments | 0 | 0 | 0
Foreign currency translation | 0 | 0 | 0
Balance at end of period | (2) | (1) | 0
Other Postretirement Benefits |  |  |
Net loss / (gain) |  |  |
Balance at beginning of period | (3) | (2) | 21
Reclassification to net periodic benefit cost | 0 | 0 | (2)
Current year (gain) / loss | (3) | 0 | (22)
Foreign currency translation | 1 | (1) | 1
Balance at end of period | (5) | (3) | (2)
Prior service |  |  |
Balance at beginning of period | 0 | 0 | (20)
Reclassification to net periodic benefit cost | 0 | 0 | 20
Current year (gain) / loss | 0 | 0 | 0
Foreign currency translation | 0 | 0 | 0
Balance at end of period | $ 0 | $ 0 | $ 0

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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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- Definition Amount, before tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation 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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