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Coworker Retirement and Other Compensation Benefits - Restricted Debt Unit Plan (Details) - USD ($) $ in Millions |  | 12 Months Ended
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Sep. 15, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Deferred Compensation Arrangements [Abstract] |  |  |  |
RDU Plan, compensation expense |  | $ 2 | $ 2 | $ 5
RDU Plan, obligation payment | $ 31 |  |  |

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- Definition The compensation expense recognized during the period pertaining to the deferred compensation arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 30 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363 + Details
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- Definition Amount of distribution made to individual in accordance with deferred compensation arrangement. + References No definition available. + Details
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- References No definition available. + Details
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