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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 | 87 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Jun. 30, 2018
Other Postretirement Benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Service cost | $ 2 | $ 1 | $ 5 | $ 5 |
Interest cost | 3 | 4 | 10 | 12 |
Expected return on plan assets | 0 | 0 | 0 | 0 |
Amortization: |  |  |  |  |
Actuarial loss | 0 | 0 | 0 | 0 |
Prior service credit | (3) | (4) | (2) | (11) |
Settlement and curtailment (gain) loss | 4 | 0 | 4 | 0 |
Net periodic cost | 6 | 1 | 17 | 6 | $ (83)
United States Pension Benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Service cost | 1 | 1 | 2 | 2 |
Interest cost | 30 | 34 | 89 | 101 |
Expected return on plan assets | (43) | (43) | (128) | (131) |
Amortization: |  |  |  |  |
Actuarial loss | 14 | 12 | 40 | 37 |
Prior service credit | (1) | (1) | (2) | (2) |
Settlement and curtailment (gain) loss | 0 | 0 | 0 | 0 |
Net periodic cost | 1 | 3 | 1 | 7 |
Foreign Pension Benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Service cost | 1 | 1 | 4 | 4 |
Interest cost | 5 | 6 | 17 | 17 |
Expected return on plan assets | (8) | (8) | (25) | (23) |
Amortization: |  |  |  |  |
Actuarial loss | 2 | 2 | 7 | 5 |
Prior service credit | 0 | 0 | 0 | 0 |
Settlement and curtailment (gain) loss | 1 | 0 | (2) | 1 |
Net periodic cost | $ 1 | $ 1 | $ 1 | $ 4 |

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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=108410482&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=112275985&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=108410482&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=112275985&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=108410482&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=108410482&loc=d3e2709-114920 + Details
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