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Other Comprehensive Earnings (Loss) | 9 Months Ended
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Sep. 30, 2021
Other Comprehensive Income Loss Net Of Tax Period Increase Decrease [Abstract] |
Other Comprehensive Earnings (Loss) | 9.Other Comprehensive Earnings (Loss) Components of other comprehensive earnings (loss) consist of the following:
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Pension and postretirement benefit plans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning accumulated pension and postretirement benefits |  | $ | (101 | ) |  | $ | (117 | ) |  | $ | (127 | ) |  | $ | (119 | )
Recognition of net actuarial loss and prior service cost in earnings (1) |  |  | 1 |  |  |  | 1 |  |  |  | 2 |  |  |  | 4 |
Settlement of pension benefits (2) |  |  | — |  |  |  | — |  |  |  | 18 |  |  |  | — |
Income tax expense |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (1 | )
Other (3) |  |  | — |  |  |  | — |  |  |  | 7 |  |  |  | — |
Accumulated other comprehensive loss, net of tax |  | $ | (100 | ) |  | $ | (116 | ) |  | $ | (100 | ) |  | $ | (116 | )
| (1) | Recognition of net actuarial loss and prior service cost are included in the computation of net periodic benefit cost, which is a component of other, net in the accompanying consolidated statements of comprehensive earnings.
| (2) | The Merger triggered settlement payments to certain plan participants, and the expense associated with this settlement is recognized as a component of restructuring and transaction costs in the accompanying consolidated statements of comprehensive earnings.
| (3) | Other includes a remeasurement of the pension obligation due to the Merger, which was partially offset by a change in mortality assumption.

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- Definition The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -URI http://asc.fasb.org/topic&trid=2134417 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 + Details
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