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Pension and Other Postretirement Benefit Plans (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 75 Months Ended
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017
Other Postretirement Benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Service cost | $ 2 | $ 2 | $ 4 | $ 4 |
Interest cost | 4 | 4 | 8 | 8 |
Expected return on plan assets | 0 | 0 | 0 | 0 |
Amortization: |  |  |  |  |
Actuarial loss | 0 | 0 | 0 | 0 |
Prior service credit | (3) | (4) | (7) | (8) |
Settlement and curtailment (gain) loss | 0 | 0 | 0 | 0 |
Net periodic cost | 3 | 2 | 5 | 4 | $ (103)
United States Pension Benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Service cost | 0 | 0 | 1 | 1 |
Interest cost | 33 | 37 | 67 | 74 |
Expected return on plan assets | (44) | (46) | (88) | (93) |
Amortization: |  |  |  |  |
Actuarial loss | 13 | 11 | 25 | 23 |
Prior service credit | 0 | (1) | (1) | (2) |
Settlement and curtailment (gain) loss | 0 | 0 | 0 | 0 |
Net periodic cost | 2 | 1 | 4 | 3 |
Foreign Pension Benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Service cost | 2 | 2 | 3 | 3 |
Interest cost | 6 | 7 | 11 | 14 |
Expected return on plan assets | (8) | (8) | (15) | (16) |
Amortization: |  |  |  |  |
Actuarial loss | 1 | 1 | 3 | 2 |
Prior service credit | 0 | 0 | 0 | 0 |
Settlement and curtailment (gain) loss | 1 | (1) | 1 | 0 |
Net periodic cost | $ 2 | $ 1 | $ 3 | $ 3 |

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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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