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Pension and Other Postretirement Benefit Plans - Narrative (Details) - USD ($) $ in Millions |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 87 Months Ended
--- | --- | --- | --- | --- | ---
Sep. 15, 2018 | Sep. 30, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Jun. 30, 2011 | Sep. 30, 2018 | Sep. 30, 2017 | Jun. 30, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |
Contributions by employer | $ 358 |  |  |  |  |  |  |
Discretionary contributions by employer | $ 350 | $ 350 |  |  |  |  |  |
Other Postretirement Benefits |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |
Reduction in postretirement benefit obligation |  |  |  |  | $ 138 |  |  |
Net periodic cost |  |  | $ (6) | $ (1) |  | $ (17) | $ (6) | $ 83

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 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 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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