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Pension and Other Postretirement Benefit Plans - Summary of Components of Net Periodic Pension Costs (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Other Postretirement Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | $ 1 | $ 2 | $ 4 | $ 5
Interest cost | 1 | 4 | 7 | 12
Expected return on plan assets | 0 | 0 | 0 | 0
Amortization: |  |  |  |
Actuarial loss | 0 | 0 | 0 | 0
Prior service credit | (12) | (2) | (16) | (7)
Settlement and curtailment (gain) loss | 0 | 0 | (4) | (7)
Net periodic benefit cost (credit) | (10) | 4 | (9) | 3
United States Pension Benefits | Pension Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 1 | 1 | 2 | 2
Interest cost | 25 | 30 | 74 | 92
Expected return on plan assets | (42) | (44) | (124) | (133)
Amortization: |  |  |  |
Actuarial loss | 15 | 11 | 46 | 35
Prior service credit | 0 | (1) | 0 | (2)
Settlement and curtailment (gain) loss | 0 | 10 | 0 | 10
Net periodic benefit cost (credit) | (1) | 7 | (2) | 4
Foreign Pension Benefits | Pension Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 1 | 1 | 4 | 4
Interest cost | 4 | 5 | 13 | 17
Expected return on plan assets | (7) | (6) | (22) | (21)
Amortization: |  |  |  |
Actuarial loss | 3 | 2 | 9 | 6
Prior service credit | 0 | 0 | 0 | 0
Settlement and curtailment (gain) loss | 1 | 0 | 1 | 1
Net periodic benefit cost (credit) | $ 2 | $ 2 | $ 5 | $ 7

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- Definition Amount of cost recognized for passage of time related to defined benefit plan. + 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 (h)(2) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109237824&loc=SL108413299-114919 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4587-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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