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Pension and Other Postretirement Benefit Plans (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 78 Months Ended
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017
Other Postretirement Benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Service cost | $ 1 | $ 1 | $ 5 | $ 5 |
Interest cost | 4 | 5 | 12 | 13 |
Expected return on plan assets | 0 | 0 | 0 | 0 |
Amortization: |  |  |  |  |
Actuarial loss | 0 | 0 | 0 | 0 |
Prior service credit | (4) | (3) | (11) | (11) |
Settlement and curtailment loss | 0 | 0 | 0 | 0 |
Net periodic cost | 1 | 3 | 6 | 7 | $ (103)
United States Pension Benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Service cost | 1 | 1 | 2 | 2 |
Interest cost | 34 | 37 | 101 | 111 |
Expected return on plan assets | (43) | (47) | (131) | (140) |
Amortization: |  |  |  |  |
Actuarial loss | 12 | 12 | 37 | 35 |
Prior service credit | (1) | 0 | (2) | (2) |
Settlement and curtailment loss | 0 | 0 | 0 | 0 |
Net periodic cost | 3 | 3 | 7 | 6 |
Foreign Pension Benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Service cost | 1 | 1 | 4 | 4 |
Interest cost | 6 | 7 | 17 | 21 |
Expected return on plan assets | (8) | (7) | (23) | (23) |
Amortization: |  |  |  |  |
Actuarial loss | 2 | 1 | 5 | 3 |
Prior service credit | 0 | 0 | 0 | 0 |
Settlement and curtailment loss | 0 | 1 | 1 | 1 |
Net periodic cost | $ 1 | $ 3 | $ 4 | $ 6 |

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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + 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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(5) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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