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Employee Benefit Plans - Pension Plan Weighted-Average Asset Allocations (Details) - DB Pension Plans
Dec. 31, 2019
Dec. 31, 2018
Defined Contribution Plan Disclosure [Line Items]    
Weighted-average asset allocations 100.00% 100.00%
Equity securities    
Defined Contribution Plan Disclosure [Line Items]    
Weighted-average asset allocations 62.00% 61.00%
Debt securities    
Defined Contribution Plan Disclosure [Line Items]    
Weighted-average asset allocations 36.00% 38.00%
Other    
Defined Contribution Plan Disclosure [Line Items]    
Weighted-average asset allocations 2.00% 1.00%