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Pension and Other Postretirement Benefit Plans - Net Periodic Costs (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] |  |  |  |  |
Net periodic cost | $ 1 | $ 3 | $ 6 | $ 7 | $ (103)
Operating profit | Other Postretirement Benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Net periodic cost | 1 | 1 | 5 | 5 |
Interest and sundry (income) expense | Other Postretirement Benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Net periodic cost | 0 | 2 | 1 | 2 |
United States Pension Benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Net periodic cost | 3 | 3 | 7 | 6 |
United States Pension Benefits | Operating profit |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Net periodic cost | 1 | 1 | 2 | 2 |
United States Pension Benefits | Interest and sundry (income) expense |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Net periodic cost | 2 | 2 | 5 | 4 |
Foreign Pension Benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Net periodic cost | 1 | 3 | 4 | 6 |
Foreign Pension Benefits | Operating profit |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Net periodic cost | 1 | 1 | 4 | 4 |
Foreign Pension Benefits | Interest and sundry (income) expense |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Net periodic cost | $ 0 | $ 2 | $ 0 | $ 2 |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of net periodic benefit cost (credit) for 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) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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