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Pension and Other Postretirement Benefit Plans - Narrative (Details) - Other Postretirement Benefits - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 78 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016 | Jun. 30, 2011 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Reduction in postretirement benefit obligation |  |  | $ 138 |  |  |
Net periodic cost | $ (1) | $ (3) |  | $ (6) | $ (7) | $ 103

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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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- Definition Amount of increase (decrease) in benefit obligation of defined benefit plan from change in terms of existing plan or initiation of new 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 (a)(7) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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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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- Details
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