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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
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Pension Plan |  |  |
Net loss |  |  |
Balance at beginning of period | $ 814 | $ 1,802 | $ 1,808
Reclassification to net periodic benefit cost | (49) | (1,629) | (150)
Current year loss / (gain) | (45) | 640 | 118
Amendments | 0 | (1) | 0
Foreign currency translation | (8) | 2 | 26
Balance at end of period | 712 | 814 | 1,802
Prior service |  |  |
Balance at beginning of period | 2 | 8 | 8
Reclassification to net periodic benefit cost | (1) | (4) | (1)
Current year loss / (gain) | (1) | (2) | 0
Amendments | 0 | 0 | 1
Foreign currency translation | 0 | 0 | 0
Balance at end of period | 0 | 2 | 8
Other Postretirement Benefits |  |  |
Net loss |  |  |
Balance at beginning of period | 21 | 45 | 42
Reclassification to net periodic benefit cost | (2) | (4) | (4)
Current year loss / (gain) | (22) | (20) | 7
Foreign currency translation | 1 | 0 | 0
Balance at end of period | (2) | 21 | 45
Prior service |  |  |
Balance at beginning of period | (20) | (46) | (72)
Reclassification to net periodic benefit cost | 20 | 26 | 26
Current year loss / (gain) | 0 | 0 | 0
Foreign currency translation | 0 | 0 | 0
Balance at end of period | $ 0 | $ (20) | $ (46)

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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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI https://asc.fasb.org/extlink&oid=126968391&loc=SL7669686-108580 + 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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI https://asc.fasb.org/extlink&oid=126968391&loc=SL7669686-108580 + Details
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- Definition Amount, before tax, of 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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (j) -URI https://asc.fasb.org/extlink&oid=126968391&loc=SL7669646-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI https://asc.fasb.org/extlink&oid=126968391&loc=d3e637-108580 + Details
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