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Retirement Plans (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2019 | Sep. 30, 2018
Defined Benefit Plan Disclosure [Line Items] |  |
Contributed to pension plan | $ 100 |
Newly eligible associates initial savings rate | 3.00% |
First 1% Of Contribution Saved [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Matching percentage | 100.00% |
Percentage of compensation saved | 1.00% |
Next 5% Of Contribution Saved [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Matching percentage | 50.00% |
Percentage of compensation saved | 5.00% |
2017 Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Contributed to pension plan |  | $ 39
Amended Hancock 401K Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Additional matching percentage | 2.00% |
Period of employment for eligibility | 3 years |
Amended Hancock 401K Plan [Member] | 4% Of Contribution [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Matching percentage | 4.00% |
Amended Hancock 401K Plan [Member] | 6% Of Contribution [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Matching percentage | 6.00% |
Amended Hancock 401K Plan [Member] | 2% Of Contribution [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Matching percentage | 2.00% |

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- Definition Defined Contribution Plan, Employer Matching Contribution, Additional Percent of Match + References No definition available. + Details
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- Definition Defined Contribution Plan, Initial Savings Rate + References No definition available. + Details
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- Definition Defined contribution plan, period of employment for eligibility. + References No definition available. + 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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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
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- Definition Amount of payment for pension benefits. Excludes other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585 + Details
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- Details
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- Details
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- Details
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- Details
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- Details
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- Details
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- Details
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