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Pensions and Other Postretirement Benefits - Other Changes Recognized in Other Comprehensive Loss (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recognized in other comprehensive income | $ (51) | $ (226) | $ 140
Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net (gains) losses arising during the year | 6 |  |
Prior service benefit arising during the year | (4) |  |
Amortization of net losses | (49) |  |
Amortization of prior service benefit | 0 |  |
Total recognized in other comprehensive income | (47) |  |
Total recognized in net periodic cost and other comprehensive income | (104) |  |
Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net (gains) losses arising during the year | (29) |  |
Prior service benefit arising during the year | 0 |  |
Amortization of net losses | 0 |  |
Amortization of prior service benefit | 25 |  |
Total recognized in other comprehensive income | (4) |  |
Total recognized in net periodic cost and other comprehensive income | $ (27) |  |

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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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