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Retirement Plans (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2019
Sep. 30, 2018
Jun. 30, 2019
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%