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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, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Other Postretirement Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | $ 2 | $ 2 | $ 5 | $ 5
Interest cost | 4 | 3 | 12 | 10
Expected return on plan assets | 0 | 0 | 0 | 0
Amortization: |  |  |  |
Actuarial loss | 0 | 0 | 0 | 0
Prior service credit | (2) | (3) | (7) | (2)
Settlement and curtailment (gain) loss | 0 | 4 | (7) | 4
Net periodic cost | 4 | 6 | 3 | 17
United States Pension Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 1 | 1 | 2 | 2
Interest cost | 30 | 30 | 92 | 89
Expected return on plan assets | (44) | (43) | (133) | (128)
Amortization: |  |  |  |
Actuarial loss | 11 | 14 | 35 | 40
Prior service credit | (1) | (1) | (2) | (2)
Settlement and curtailment (gain) loss | 10 | 0 | 10 | 0
Net periodic cost | 7 | 1 | 4 | 1
Foreign Pension Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 1 | 1 | 4 | 4
Interest cost | 5 | 5 | 17 | 17
Expected return on plan assets | (6) | (8) | (21) | (25)
Amortization: |  |  |  |
Actuarial loss | 2 | 2 | 6 | 7
Prior service credit | 0 | 0 | 0 | 0
Settlement and curtailment (gain) loss | 0 | 1 | 1 | (2)
Net periodic cost | $ 2 | $ 1 | $ 7 | $ 1

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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of 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)(4) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: 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 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(5) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(5) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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