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v3.19.1

Employee Benefits (Details) - USD ($) $ in Millions | 5 Months Ended | 7 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2018 | Jul. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Matching contributions amount | $ 7 | $ 10 |  | $ 15 | $ 16
Tranche One |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Employer percent match of contribution |  |  | 100.00% |  |
Percent match of gross pay |  |  | 2.00% |  |
Tranche Two |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Employer percent match of contribution |  |  | 50.00% |  |
Percent match of gross pay |  |  | 4.00% |  |

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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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